Restricting temp comp to 3mv (unless the battery manual suggest this number) you make it run at higher than recommended voltage when it's hot, and at lower voltage when it's cold. Seems counter-intuitive, let battery gurus correct me.
About preventing battery from discharging under loads. As long as the solar is adequate and there is enough sun, it will keep battery in Float, diverting the excess energy to loads at the same time. There will be NO discharging. Sounds like your system is undersized - solar can't keep up after "normal" 100-120 min boost charge. But then again, who can tell exactly when battery should go into Float...
Keeping controller forcefully at 14s half the time, you are trying to push AH into battery by keeping it at higher voltage, kinda similar to how people without solar are trying to achieve this with generator. Not optimal, though I can understand the reasons.