Streaks

So, I've just done a mod to print on aluminum.  One thing I'm noticing is that sometimes it looks like the plastic doesn't extrude, so on the surface of my model, it leaves streaks, or lines where the fill layer shows through (ugly).  Now, I've done a number of things putting things, any of which might have caused this:

1)  I cut an aluminum plate and put kapton on it.
2)  I releveled the bed
3)  I brushed out shavings in the piece that pulls in the filament.

So I'm thinking either
1)  The bed/aluminum isn't level
2)  When I brushed out the plastic shavings, I only did one side, so it is slipping on the other (I just tried to clean out the other side while I'm printing to see if that improves things.  Doesn't look like it.
3) ??

Any ideas what is happening?  I could switch back to printing on the standard bed and see if that fixes it. (included picture to show what I'm seeing.)