I use invisable thread alot . A couple of things the top tension typically has to be adjusted way down. I use a very small needle 70/10 , this even works on thick batting. I use alot of invisable thread so I buy it on a cone , and using the thread holder stand really helps to get the tension relaxed before the tension discs. I had the most trouble using it on the machine spool pegs. It just did not want to unwind or theh spool move.
All brands of invisable thread are not made the same. Some have so much static in them it is nothing but frustrating. I have the best luck ( I need to make almost no adjustments in tension) is from Prim/dritz. This particular brand , is one that I can use on all of my different machines and have success. I get it from a catolog company called Home Sew.
Using invisable in the top and bobbin is really frustrating. I recomend only using it on the top.