Binding with a right angle binder on a walking foot machine

[Dave9111]

I am using a Pfaff 1245 walking foot and I purchased a right angle binder setup probably 10 years ago and I have never been able to master this thing.

I bought 100 yards of polyester single fold binding from Rochford supply years ago and it works ok on straight runs or large curves.   

The Rochford binding is rather stiff so I have to fight it when doing tighter turns, about 6 inch radius and less.   So I thought I would try and buy some double fold polyester binding off Amazon, it was cheap.  Its a thin material but it doesn't work well in the binder.   Somehow it rolls sometimes after making the turn in the binder.  My guess is that it is not stiff enough.

So what next? 

Rochford, Wawak, and Amazon all have a lot of binding, but I have no idea what will work well in this binder.

Do I just keep guessing and buy a few different kinds?   Wawak offers heavy, medium and light single fold binding.    Is there any standard for what is Heavy, medium and light?

Would woven, unfolded, twill binding possibly work?  

I never thought that binding would be this challenging!   Are there any how-to's written on how do run a binder?  

Are straight binders more forgiving than right angle binders?

Thanks,  Dave