Trash Can to Baitwell conversion - advice?

[Arbutis]

I'm in the process of trying to improve upon my baitwell/livewell contraption. Last year I took a large 44 gal Brute trash can and rigged it for an onboard livewell. It worked very well to keep fish and crabs alive and kicking but when I dumped a net full of bunker in, the death toll added up quickly. I assume that my 'flow' is a bit off and I need to aerate more and circulate better. I have a very basic setup of pumping water in and draining water out through a drain tube in the side of the can.

This year I am upgrading my pump (800gph Rule Tournament Series) and attaching it to a thru-hull with a scoop to collect water while under way. In the past I had very poor flow of water coming in while going slow to medium speed. I am also thinking about creating 2 inflow water valves (a top for aeration and a bottom for fresh bottom water) and a drain which drains the bottom water first. Previously my drain was just draining the top water and the bad water was basically staying stagnant at the bottom. I'll get some photos to post soon.

My question to this forum - who else has a homemade livewell and if successful, how do you have it rigged. I'm looking for BIG ones - none of these little cooler conversions. Mine is BIG and round with no internal obstructions - the goal being to let the bunker swim in a circle without bumping into things. Thanks.