So, after a WC helped me with a tweaking and balancing some things out, submarine should be in the most bestest condition ever (big thanks to him!)
>Chaingun "Maelstrom" shoots a little bit slower
>Engine now is slower 28 km/h 20 km/h (with all engine buffs), as it should be, its a bulky boy afterall
>Pumps now reduced to a 550 flow speed, so its not insanely fast on pumping out water
>Fixed waypoins thanks to WC (once again)
>Changed moonpool so bots dont die in there thanks to WC (once again)
>Lowered HP on armor plates to 350 cus old had already fully upgraded HP number 550
>Reactor is no longer shredding fuel rods, its been lowered from fuel consumption of 0.700 to 0.400!

These are great changes overall but I would make the engines a bit faster again? Like it's a big bulky ship but most ships can easily hit 30 KM/H with buffs. A nice in between of like 24-25 KM/H would make more sense imo. At that speed you can't outrun most wildlife (Which is more fun), and missions won't take super long to finish.

A more middling speed also means that you don't get messed up if you lose your captain/and/or mechanic, at which point the ship is basically a snail.

Not to mention it's a little weird for an attack ship to be so slow that theoretically it wouldn't be able to maneuver itself into a position to fire at and chase enemy submarines.