Need some help

I need some help. A fairly easy fix (or at least so I imagine in my head).

I had a character all planned out. A party. I was going to be a gnomish Wizard Slayer/Assassin and I was going to cheese the hell out of it, because cheesing is what Baldur's Gate 2 was made for. I wanted to do something useful with a pretty worthless Kit (Wizard Slayer) and play a completely atypical party.

I get everything up and running. I sink a couple of hours into it. I create my character and.. he starts with 7 (or 6?) Magic Resistance. At first I thought this was due to some Fixpack, but as it turns out, Throne of Bhaal introduced a completely borked magic resistance progression for the Wizard Slayer.

All I want to do is bring back the original progression of the Wizard Slayer. That is, instead of 1 MR/level until level 20 and 1 MR/5 MR/every other level, just a flat 2 MR/level would do. This ultimately means that I get less MR (by level 40, 80 MR vs. the current 90 MR), but on the other hand, the MR I do get can actually be remotely useful by the time I need it.

This should be a fairly easy fix and I wish I could do it myself. Any takers?

I'd also like to request an ability identical to that of the Inquisitor, but that would just be icing and entirely unnecessary (but it would be nice if someone bothered). I intend to use this with the Multiclassed Multikit Builder Mod if that is of any relevance.