Patch
Pre-takeoff checklist
If you can tell the difference between 55 and 60 visually (outside references, AI covered), you're a better man than I am, Charlie Brown.
In the T-6 you could. At 60, the horizon lined up perfectly with the glareshield. Much easier than trying to judge 55 on the ADI.
If the examiner tells you to fly 55 degrees for the steep turn, and you just "kiss 61" and come right back below 60, you've not "consistently exceeded" the standards, and you're still in the realm of "satisfactory performance." However, if you choose to aim for 60, you are putting yourself in a corner, because your +/- 5 range could lead you into consistently exceeding the FAR no-chute limit as well as the aircraft's performance limitations, and that's a failure.
If you can't hold 60 degrees by the time you get to the checkride, maybe you shouldn't be there? Seriously, you have to overbank the hell out of the aircraft to get into the "aircraft's performance limitations."
The discussion here isn't exactly about making you a "better pilot," just making you a "Commercial Pilot." The two are, regrettably, not always synonymous. In any event, since the Commercial PTS says "at least 50" and within 5 degrees of the desired angle, and the FAR's say not over 60 without a chute, aiming for 55 seems to me to be the best way to achieve the stated goal of passing the Commercial Pilot practical test.
That's a shame, but I do understand what you're saying.