String Help

So I have been using regular kitty string lately and The string Has just been getting loads of tension faster then any string I have ever had before. I am getting back into yoyoing and this does not help to relearn tricks i have forgot and I just need some help on any string that is good for more advanced tricks. and also if making your own string is good and if so how to make it?

Have you tried stretching the string first, that might help. Also keep an eye on your string, if its getting gritty, and funky looking. Not playing like fresh string. Change it. But when using kitty string, you need to stretch it first.

Thank You!