your play style is literally the oposite of mine in every way and every time i see you play i have an aneurism, and the moment you said 13:30 "i basically have too much supplies" a piece of soul died.
The only thing that is problematic is when someine has to split up their units towards thr mountains,the main road and the island guarded by millions of ships
Just send some infanty like 2-3 is enough to cap, i played with someone and he only have one main but i have like main my main force with him, and send infantry to mountain and the island and take rhe charge of navy, i have pretty much decent navy 2 supply ship, 2 destroyer, a battleship, and a diesel sub
I ended up focusing on naval first and then just dropping light turret bunkers all over my base. Then I captured half of their vehicles on my way to their headquarters.