I think it's easier to use boucle if you use large needles. I just made a scarf with some alpaca blend boucle and I could feel the bumpiness wanting to catch, but with larger needles, it was better. I think I ended up using 10 1/2.
I also think metal needles are a help, too.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry