recommendation on bowden extruder

Hi,

So I converted my da vinci to bowden setup. I also bought e3d Hobb-goblin gear for making the bowden extruder. Initially I tried Neustruder that is suppose do work with mk8 (hobb-goblin has almost the same ID I think) but it started to bite into the filament far too heavily causing the skipping to occur. Next I tried the compact bowden extruder design from Thingiverse with more or less similar results. Hobb-goblin just bites into either ABS or PLA filament far too much and it is very tricky to get the tension just right. At the moment I reverted back to da vinci extruder gear, setting the old carriage up as bowden extruder. This actually works relatively well but if I want to try something like Ninjaflex in the future, Neustruder would be needed.
So my question is: 1) should I get mk8 for Neustruder, does it bite less into filament than Hobb-goblin? 2) Should I perhaps get mk7 and print parts to use it in bowden extuder? or 3) does anyone know some good all-metal commercial bowden extruder that would work hassle free?