I would do your top dressing every ten days, thats the rule of thumb, when i have cute lil guys inside ill put a spoon or two of guano or whatever is laying around every 7-10 days. Gia green is fine, Mr.Bs is great and pretty cheap too. I just buy the DTE bags so i can make my own mixes and control what i am using at what volume. Alfalfa is commonly farmed, but possibly not in your area hence from feed store, but alfalfa seed sprouts is a common health food and you can probably find it at the local health foods store probably in sprouted form. I am sure you can order them for cheap, round here i roll over to the feed store a get it by the pound for under ten. You can make a alfalfa ferment or a aerated falfa and kelp tea right now would do wonders. Your going to want to rock balanced npk for a week or two. Remember compost tea or AACT is not a food for your plants, more like for the soil.
I honestly think your on a cool path with this project and think you could get it honed in really easily. I mean, even growing organically i feed a crap load more than you do. I do the same thing inside as i do out side, as soon as they are in rapid growth. Top dressing SST, and AACT every ten days or so Fish weekly, and alfalfa kelp tea weekly. Bump up the fish and top dressing till you see mild burn, keep it there for ten days start bumping up again ride that fine line of feeding to the max not over feeding.
One top dressing a month and a semi often non NPK compost tea in Coco wont do it....Why no Fish? thats my go to for all things N all the time. Even the cheap crap from the hardware store works....