Yeah, I noticed that there is a ton of proximity effect on a lot of those stock cabs. I switched over to using redwirez IRs almost immediately after getting my Axe a few months ago and I haven't messed with the stock IRs that much.
On a side note...before I got my Axe Fx, I used to record using an isolation cabinet with a Vintage 30 loaded in it and an SM57 and e609 Silver. I would get extremely pronounced proximity effect, but I found I could dial it out by cutting heavily below 100 Hz, cutting 3-6 dB at 250 Hz, and boosting about 3 dB in the 1-5 kHz range. Maybe I should try that with some of the stock cabs.