Congrats on the speakers! Welcome to the forum.
Yep, you're already maximizing bass with speakers/subs the way you're doing it. What sub(s) do you have?
Personally I have speakers with good bass capabilities but my subs are much better so I set mine to small and use the lfe setting and use a crossover of 100hz. General advised starting point is 80hz, but experiment. Some like to just up the sub level a coupla/several dB. It's just preference in the end. What crossover did you set for using LFE+Main?