Not familiar with a Pro Force Blue shaft. There is a ProLaunch Blue made by Grafalloy, and it appears they did make a .355 taper tip at one time for the aftermarket, but we never carried it and they no longer make it. Any tapered options available in other models would be discrete length shafts, so depending on how long your playing lengths are, that might limit the choices. Might consider boring out the hosels to accept .370, which would open up the options and allow you to use the raw 41″-42″ blanks (depending on the model) to trim for your desired flex and playing lengths.
Britt Lindsey