I noticed that my Attack Bonus seemed a bit low when using Dragon Shape so I ran a few tests with it and have figured out that two sources of AB seem to not be factoring in properly for this shape.
1. Greater Magic Fang is only adding +4AB rather than the full +5 that it should be (testing this on normal wild shapes found that the +5 IS working properly there).
2. The +1 AB for size is also not appearing for dragon shape.
At level 30 with medium BAB, my base AB is 22
Dragon strength at 37, with a +3 str ring, gives 40 strength, and therefore an additional +15AB
Upon casting Greater Magic Fang, this total gets another +4
The end result is 41AB when GMF is applied, rather then the 43AB that should be showing if GMF was working properly and the +1 size bonus was in effect.
Just in case this was a matter that simply showed up wrong on the character sheet, but still gave the proper AB in combat, I went to go test that value. Attacking an orc in the cloakwood confirmed that the AB is only 41:
