That mushroom compost is awesome stuff, used to get it at lowes but last couple of times I've been there they were out. I also use a planting mix they sell that I really like called Jungle Growth. I fogot you have a bunch of cows, no wonder everything looks so good.
I go a little bit lighter than I used to. I used to go crazy with Nitrogen thinking if a little is good a lots gotta be better. For a couple years I had beautiful lush bushy tomato bushes and no tomatoes, those I got had blossom endrot. When I pot I add a couple cups of kitchen compost for the microbial activity, seems to keep plants happy, then I toss in 2 tablespoons of epson salts. bat quano, bone meal, and a slow release balanced mix 5-6-8 and about every 2-3 weeks add a couple tablespoons of the slow release till fruit starts setting. Then every 10 days or so I use a weak drench of Miracle Grow. This is working better for me more so than anything else I've done.
You were talking about maximizing yield, theres a guy I follow on Youtube that does what they call the Kratky System in a hoophouse. It's a hydroponic system in Dutch buckets and he gets some outrageous yields. Even though I don't grow hydro I find it's interesting to learn. This guy does quite well.
here's his home site wit a lot of videos.
mhpgardener