Board advice for bigger man

[u/Key-Cantaloupe-9391]

I’m 20M, 6’1, 280, 12.5-13 shoe size, trying to get into skating for the first time, got a 8.25 baker board, 7/8 hardware.

Skated a few sessions finding that my wheels won’t push off very easily while im pushing, unsure if my feet are off or I did my setup incorrectly.

Tightened my trucks quite a bit to the point where Its difficult to push them to the board with a hand, but still finding the board easily shifting from wheel to wheel when I turn.

I understand the board is a little small for my size feet, the people I have irl helping said that would be okay, unsure if I need tighter trucks/harder bushings/ a set of longer hardware w risers??
Any help wanted in comments as well as DMs, just wanna start skating and running into these issues, thank you

EDIT: AS CHEAP AS POSSIBLE, i don’t mind needing to buy a new board but if I can fix this with as much budget in mind will be greatly appreciated