Im getting HUNDREDS of mobs spawning... the spawn.json is being completely ignored.

Spawn.json = https://pastebin.com/PpDrKFJJ

Potentialspawn.json = https://pastebin.com/9KVSkKGu

Your spawn.json is totally wrong. On line 4 you start a new { nesting level:
"mobs":[
{"mob": "tfa:tfa_shark",

Why? That doesn't work. Check the wiki for how to actually write the rules: https://wiki.mcjty.eu/mods/index.php?title=ControlMods

Why? To group all mobs from that dimension together. I'm very familiar with your wiki already... obviously I came here for some help because I am not understanding something.. If you could offer me some assistance instead of just sending me to the wiki and closing the ticket, I would appreciate it.

Well the syntax doesn't allow grouping like that. After 'mobs' you can only have a list of mobs. But you have a list of condition expressions after mobs. That doesn't work. i.e. I'm talking about this snippet:

"mobs":[
{"mob": "tfa:tfa_shark",
"onjoin": true,
"mincount": 6,
"result": "deny"
},

You can only do something like:

"mobs": ["mob": "tfa:tfa_shark", "othermob", ..."],
"onjoin": true,
"mincount": 6,
"result": "deny"

Hope this helps