My views are the same too. Firstly, i always tend to overdo things on a just incase bases lol Id rather have tons of biomedia and filtration and have it spread out in two filters to stagger maintenance, then have just enough space. I have two aquaclear 110s on my 75 and both are stuffed to the rim with media. I have sponge then filter floss in both, then crushed coral filling the one and biomedia and purigen in the second
For flow my tank is actually really calm to the point of im thinking about adding a smaller powerhead to remove some dead spots. The AC110 output is pretty spread out so it doesnt create too much current in the deeper tank