Good Initial Timing and Too much Total Timing Problem. Seeking guidance to minimize total timing. 1969 Swinger 340 4 Gear

With the vacuum can connected, 57 is perfectly acceptable. You don't include the vacuum advance when measuring initial timing. The total timing usually ends up between 32 and 36 degrees. That's initial plus mechanical. If you need to limit the total mechanical advance, it's time to disassemble the distributor, weld up and file the governor slots to the specific width to give you the advance you need.