Well, the SL is going to be nearly identical in construction to yours but with an updated camber profile. So there's that to consider.
There is a huge difference between Slayblade '13 and Slayblade '14. Camber. The new one has Lifted. Flat between the feet, camber under foot, and flat outside the feet. On the Happy Hour the camber rode like rocker when you needed it and camber when you needed it. The profile works. Harshmellow is for real. It works great.
Honestly the Turbo is closer to the SL than the Slayblade.
I'm not entirely sure either board is really the best for you style and conditions. Would you be up for other options?
Go ahead, drink that kool-aid.
FS: Forum Sauce 142 $200 plus shipping
FS: Flux SE30 $75 plus shipping