Gdetrailer - there has been many changes and upgrades to Mr Wiz solar system, and in the end I don't know how well it performs. One thing is clear - adding 60-70 AH daily load - like replacing LP frig with 120V frig - without adding some power source can not result in a shorter generator time. Achieving this would mean inventing a perpetuum mobile machine and I will be the first one to congratulate such a person :)
When you take 60 AH out of the battery - make it 70 AH after inverter - you need to put 80-85 AH back into battery. To put 80 AH into battery, you need to run 2000W generator for 1-1.5 hours, maybe 2-2.5 hours, depending on the battery SOC and other loads running. There is no free lunch in energy use - when you use more, you need to get it somewhere.
To meet these increased energy needs without increasing the generator time, you need at least 350W flat solar panel. Increasing the battery bank will help very little.