I am running a 15" motor.
Alby Pine has the same setup with a standard height transom and has no reported problems.
Aaron Wacholz (Black boat pictured) wanted his cut down.
I decided to cut mine down because I liked the look of Aarons. Those extra lines in the back add a lot of strength and some "texture" to an otherwise flat rear deck.
Look at the rigging hoses in this pict. I think if you wanted to be able to trim up without jacking the motor up all the way, you would kink your cables...

Ron Pratt
Okanogan, WA
Viper/ 2.5L 200 Merc (SOLD)
1991 "the last" Virage/ 15" 280
2003 9’ Mini Virage/ 15 hp Honda 4-stroke
1989 Voyager/ 300 Promax
1989 HST / 2.5L 200 Merc
http://www.prattcustoms.com