[mwebb]

if the system does not have a knock sensor
switch it back to the recommended
Base Ignition timing value or you will find degraded performance increased emissions and
engine damage

peak combustion pressure must happen right about 14 degrees after
TDC at all loads and engine speeds except
DFCO and idle

you just changed your peak combustion pressure timing by the amount you changed your base ignition timing by
bad idea , there is no benefit for doing this .

and for the others
who are considering setting their base ignition timing properly
understand that
the system will not go to base timing if
the closed throttle switch is not closed

so if there is a TPS problem in your system
do not adjust your base ignition timing