Well, the reason I ask is this. If you have a 27" hull, and many say the limit is 45mph for reasonable control with stock 1" trim plates, by increasing to 1.25" or 1.5" you might extend that speed limit a bit more and improve control.

You mentioned a spoiler. How about a adjustable canard?

Also, wouldn't longer turn fins and rudder improve controlability with the higher speeds?