Sounds like you have been doing multiple runs and its getting hot and reducing the power to save itself. Ambient air temp will affect power, as will altitude and fuel quality. If you have air temps of 25c and 97 octane, id be happy with 315 at the flywheel, you will not get 315 at the wheels on a std car, especially in the summer! Std 345 at flywheel would probably show 290 bhp ish at front wheels on a 2wd front drive dyno anyway at 20c .
No nothing.
No Mods. No rockers. Just a chunky knob, thats now been replaced by an RS knob innit.
No tackiness.
Std as Ford intended, but with a space saver wheel and jack and nuts and wheel brace. oh.. and flaps, a man has got to have flaps.
Innit?