Personally id start with a lighter spring.

BTW ive used the hell out of the ebay boost controllers, and ive built my own, both work well. $30 isnt bad unless your dead set on making your own in which case more power to ya.

 

Well I just made one. We'll see if it works or not. I had to use the stiffer spring cause the other one kept getting stuck and finally just fucked itself all up. I hae to cut the good spring to the exact length of the "body", so I hope it'll work. Thanks for the help.