Yeah indeed mate all things need to be tested. Ill be interested when u get the new seal maybe theres a compromise to be had somewhere . My bro definatly noticed a substantial difference when we got back from the test ride he kept saying how he couldnt believe the difference . Luckily its an easy one to test by just slipping it back on on and off.
I do agree the top end is definatly better obviously due to the easier breathing but I havnt noticed any loss in torque down low but that might be just my uneducated seat of the pants evaluation.
Remember I have exactly the same set up as you with bb kit and short tors and the most important bit the blue white colour lol.
Keep us informed.