Congratulations on the new system !

The small/large settings do sound suspicious, I would try setting all to "small", with 100 Hz crossover for the center and 80 Hz for everything else. Many of us have had to decipher the HK bass management -- all I can say is that nearly all of the confusion relates to things that are either harder or impossible to do on other receivers, so it's not all bad.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8