See if they have rolls of foil-backed fiberglass wrap. It's supposed to be a "one-size-fits-all" solution when used with insulation tape.
I used this method after I destroyed the original "tube" on my Filastruder when I disassembled the barrel.

Yeah, I'll try that. They do sell rolls of fiberglass wool but only if you purchase the whole roll (which is sufficient to cover your entire ceeling) and I only need a small piece, which is the reason I have not purchased it yet. Something else I have noticed that is affecting my filament consistency, is that when a lot of pressure builds up on the tube, the motor tries to slow down a little, and that causes that alters the whole extrusion process. I'm thinking about purchasing a 1/3hp geared motor and adapt it to the extruder, that should be enough to keep the motor running consistently even with all the pressure built on the tube.

Are you extruding on to the floor or you use filawinder ?
YOu cant get perfect extrusion without filawinder.
PLA is softer then ABS when it comes out of the nozzle, so any force produced by bending the filament down the road, or the change in pulling the filament down (gravity) will mess with a diameter.
Thats why its so important to have CONTINUOUS curve of filament going to a winder.
See my filastruder review.
https://www.youtube.com/watch?v=sjmGWysUbn4
Watch entire video, you will learn allot.

Once you get consistent diameter (what ever it is) start dialing it up or down with the nozzle diameter.
Make sure barrel is insulated (stable temperature)
Make sure fan does not blow directly at the nozzle (stable temperature)

I do have a filawinder. I had already watched your filastruder review some time ago (I like your sense of humor btw) but I do not own a filastruder, I made my own extruder based on Lyman's design with a high torque wiper/windshield motor, a regulable motor speed controller, and a pid controlling a heating band. In summary, pretty much the same as a filastruder but I have more control over the settings involved on the extrusion process. I purchased the filawinder a couple of months ago hoping to get better filament tolerances and it did help a little, but it's still having troubles to find the sweet spot.
About insulating the barrel, I'm guilty of not having done this before. My local hardware store doesn't sell small pieces of fiberglass wool and I have been too lazy to go to another hardware store, I guess I'll get it this week and test again.

Once you get consistent diameter (what ever it is) start dialing it up or down with the nozzle diameter.
Make sure barrel is insulated (stable temperature)
Make sure fan does not blow directly at the nozzle (stable temperature)

I did create something for the filastruder community. I saw funnels out there but didn't like the way they went into the throats of the bottle reducing size and flow volume. So, instead I modified 2 other "things" on thingiverse and created a funnel with female threads! Works great!

http://www.thingiverse.com/thing:1250555

Hope you guys can use it, it has made my life easier as far as filling small coke bottles for test runs as well as larger 1 liter and 2 liter for production runs!

Thanks for that idea Ian!

Question about the hall sensor on that filawinder..... It seems I almost have to have the magnet within 2mm of the magnet, or else it wont pick up. and its oriented the correct way, I didn't do like you show in your video of spinning it and let it settle. Instead of used tweezers and moved it past the hall sensor and flipped ends till it moved. Even then I had to drill a tiny hole through the gear to push the magnet out a little and bend the hall sensor out to the magnet. Otherwise it doesn't seem to pick it. up. The shield is quite simple and nothing can really be failed there, so I cant figure out if maybe the hall sensor is bad? The magnet is super strong so there is no question about the magnet..

One of my problems I cant overcome yet, because I am not that well with designing using sketchup or the others, is my spools like from FlashForge (I was told they were octave?) the hub is recessed into the spool so it drags and grinds on the nano of the winder. I have some others too like a spool from geeetech (junk I know) and the hole is bigger and the gear that comes with the filawinder just barely fits the hole but it too rubs. Is there any one that has made a gear side that has a larger sized cone to fit these types?

I wish I was better with these programs but when it comes to gears, blah, I cant do crap yet. lol..

Regarding speeds - IIRC both of your motors are of the old variety. Yo'll get about 80% more speed with the newer ones.

Where do i get a new one ? I want faster extrusion too