Who does your tuning? I just got a 15% lower and am going to order injectors and want an e85 flex tune, my current tuner wont do it.I was happy with my IW 15% lower/stock upper and 93 pump with some Torco when racing. Even without Torco the Lund 93 tune was safe on datalogs.
The lower pulley gives you a better SFI balancer and better belt wrap.
I think you'll be happy with the 10%/2.5 .
Jam you seemed to enjoy the drag style like I do, so upgrading to a rear ice tank and HE with fans might be a good idea. Consistent low IATS allows higher boost on pump.
I actually just finished replacing my front bumper with a tubular design, allowing me to add fans to the stock HE and finishing the rear ice tank lines.
Cars ready to rock, going up in 2-3 weekends for some fine tuning and just enjoying the car until fall racing.
-J