PLT,
Are you on 75 or 05?
On the surface of it (slopy shoulders), it is your PAS salary (as those on PAS no longer receive flying pay, all your salary counts towards the pension). However, PAS rules may also apply, such as completing a minimum of 5 years to qualify for the enhanced pension - and I believe that you qualify for the "extra" pension after you have served the 5 years. If though, you left before the 5 year period had elapsed you got the standard pension for your rank (did that get revoked on Appeal?).
To my mind, even if you ended up leaving, isn't it in your interest to strongly consider the PA offer now anyway? If you were to PVR on day 1 of FAFPS you would not lose any flying pay and you would not suffer a reduced PVR rate pension on any pre FAFPS pension because you didn’t PVR from it. On the surface of it, with the accrual rates being announced and because the EDP/Gratuity hasn’t been changed to the point that it will adversely affect most people attracted to PAS anyway, why not give it some serious consideration..?