A higher power servo would help but my advice is to check your disc/pad setup as this is crucial to setting up the 8ight Ts brakes...if the gap between the pad and disc is too great then you will be at the end of the servos throw, or at the brakes caliper arms limit, before max braking is achieved, also ensure that your EPA's are setup correctly as this also can be a cause of below par braking.
I've been using my cheapo backup servo on my 8ight T after my ACE DS1015 gave up and to be honest the braking is still strong enough to lock the wheels up on the loose surfaces and do stoppies on tarmac
