I just installed 60's this morning on my GTP and only changed the IFR table. Here it what the table looked like:
Throttle%: 0 10 20 30 40 50 60 70 80 90 100
Fuel Flow: 62.0 62.9 64.0 65.5 65.9 66.0 66.2 66.3 66.4 66.6 66.9
Didn't touch PW or anything else. Seems to be doing just fine. Minus the fact that my fuel trims are all over the place at the moment until I get into PE mode.....