To FIM or not to FIM?

Need some advice lads!!

I'm growing out a few different strains

Tangerine Dream, LSD, G13 haze, super lemon haze, HGF cheese.
my set up is

12 x 12 x 10 flowering room, 10 foot height, 8 x 600 watt HPS duel spectrum, lumatek dig ballasts
12" rvk inline exhaust , 10" rvk intake. 12" rhino filter, temp/humidity control etc..

im growing my 15 mothers from seed in soil/perlite all looking great, few different phenos start cloning next week, im going to grow the clones in coco 75% and perlite 25% maybe in 7 gal buckets, full canna nutrient line up

I have a few questions for you advanced growers who have maybe grown out these strains before, ive only ever grown out ghs white widow and dinefim blue widow before, and in a smaller closet area with good success.

how many of these plants would you say i could grow out in this size room without over crowding and should i fim or top?? i want to get as much yield as possible out of this room. Should i pack the room with smaller plants or grow out larger ones? im kinda confused about this i don't want to waste time by testing and making the wrong decision, i don't have a veg room so i wont have a continues flowering cycle if you know what i mean.

any insight would be well appreciated.

Lsd and cheese are indica, so they would do fine being fim'd, the rest of those are sativa so they will grow taller, i would recommend topping or fim/ lst the sativas, look at my grow i have 2 Aurora indica that i fim'd and lst'd, i sould say fim and give them a good 2 weeks to recover

Ive tried Fimming and Topping, had good results with both. Altho I find with Fimming which it might be just me, yeah its nice having 4 or 5 maybe sometimes more Tops(heads), but i feel the lower branching in general of the plant suffers. Where as I top, I get better side branching. might be just me tho