Since completing this mod I've now had a chance to have a good few hours on the bike. I can honestly say I cannot notice any difference with slow speed stuff, or at any other point. I have checked the settings and I have adjusted it spot on!
Oh well - perhaps it's just me, I'll give it some time and see if I can notice a difference. Am I the only one that is not getting any benefit or are you all just imagining it in?!
(the mind can play funny games!)
I didn't have any problems with the bolts - wouldn't advise hammering the conventional torx bits into the screws though!
If you are about to do this mod - go and get a quarter drive ratchet and the proper torx bits rather than hammering away or burring up the nice shiny bolts!! A quarter drive will fit right in there with no awkwardness at all.