Currently I have a roto grip haywire, storm sky rocket, motif forza redline, and a motiv tag. I'm itching to get another ball, not that I need one. I don't really feel like I have a gap anywhere right now with just bowling in league. The forza and tag for me are great on the low side and the haywire and skyrocket take the high side. I'm thinking I want something more aggressive than the forza. What would be good? I've been eye balling a lock but not too sure on it as I haven't seen many. Maybe a crux pearl?

I've seen a few Locks being thrown and it would probably be a nice addition with the Haywire. The Lock seems to have a lot of down lane movement for an oiler where the Haywire is more of an arch. Probably be a nice ball to move inside with when the Haywire starts leaving the corners.

With the other balls you listed, I don't see a need for a Crux Pearl. You have that slot covered already.