Yeah, the more I think about and understand your situation....Brand, i keep looking at your setup makes me want to drill new holes on my stand and flip my tank around so the drain goes straight down like that. everyday i change my mind and come up with more crazy ideas that push back this damn build
Turn your sump around, and get a drain hose as I posted. Will give you gentle bends, and easy to install and remove. Want one? Have one, brand new, you can have it.
Then the return pump line will have to go across to the other side, which will give you move room for the t-offs you want. Much better to t-off the straight line as Brand's design does. Instead of one t-off that feeds a bunch of tee's as your pic displays. Although a much better idea to run a dedicated pump for tank return, so you know how many gph you're returning