I`ve experimented with x 11 Victorys and found by accident when I was in One of my Teams Captain Garden tinkering with our Bob Longs, ( Andy Watkins ) ( from him I`ve learned a lot about these markers ) when shooting I found using an SLP Reg there were more inconsistency with the FPS and was Much better to use a Reg lowered to x 450 than the SLP, in fact I learned a lot about Regs that day,
I`m sure it doesn`t always apply as many use a SPL and are happy as such,
but for me ? well I sold the SPL the next day.