Brandon, wow! Why do they get stressed out? That still seems to be plenty of flow to me.
Wet/dry filters when properly setup don't waste much co2. Matching flow to drain tubes is essential. If I had a one inch drain line it would last about 3 weeks because of the amount of air being pulled through the siphon. Bigger drain lines reduce this. Or less flow.
So by reducing the flow I'm reducing the amount of air being pulled into the media chamber. If I don't adjust co2 down. Fish get crazy stressed fast.
My plant beds are also very very dense at this point so having the extra flow distributes co2 better throughout the plant beds.
Really a good trim would solve that it the fish love to play in them so much it's hard to justify thinning things out.
My blyxa is my shrimp haven, it's the only thing that keeps them alive. Without it everyone else would tear them to shreds