Is This before or after the dirty A-axis pinion??? If the SG had it rough before you got it....I would really look into replacing the slip rings in the lower A-column. Eliminate any wear & tear items.... I would also look at the the B-axis servo motor too...its "geared" and if there were alot...
I talked to Our lead operator in the flat Dept today....he pulled the CC's for HR .500 out of our 4K MKII. I know this doesn't help you in the beveling... but maybe some good starting points to build or tweak from. (the mkII has a m32 control...so I translated to the fanuc for you)
M32...
It looks to me like ur using the 15-30° Fast bevel as a starting point.... which might be fine if u were cutting away from the part. You might want to try the 15-30° SLOW BEVEL, It's really slow.... but maybe Pulse cutting is your answere?
G13 P0
G32 P1 T3 R0
M32
M22
G01 S4000 P16 Q20 F60...