Ok cool i shall try that 

Yep, I prefer that to using set-weave fabrics. Gives you the same stability, but I find you can still massage it into place for a time (after too long the adhesive becomes a bit too solid and the fabric handles a bit more like a standard set-weave). 

What about misting the back of regular twill with a spray tack? Just to hold it slightly.

You can heat it a bit with a heat gun but it just isn't great for complex parts. 

What is the best way to soften the glue on the back of pro finish fabric?