Dwaive, I want to go back and examine what you are saying about your battery a bit more closely.
When you say "44V tilt backward full pressure" it is important to know what the voltage was 'at rest' before you put the load on it, and generally speaking, if this battery charged up to 49.2 volts at rest before loading, then you DO have a bad battery if it drops to 44 vdc (and DO read the tenths of volts).
In fact, new AC trucks rate the battery at 20% usable charge left, when they reach the 'rated' voltage, so a battery at 48.0 volts means it is time to recharge the battery, not that the battery is fully charged. We used to allow a bit more discharge in older machines, but it was not good for the battery's life, we just figured the battery would die from abuse or lack of proper maintenance, anyway.
ALSO you have given us a model number but I did not see your serial number, and if anyone is going to be able to provide you the correct settings, they will need the serial number of your truck (and maybe some motor measurements too)