Realize that you're putting up a good fight. 9 x 11 x 7 is just tough. You might want to consider replacing the snare with some of the aftermarket drum replacers if you 'need' a specific sound.
Otherwise, continue experimenting to squeeze as much quality as you can given that space. If you ever end up moving to a bigger studio/room, you'll be that much better of an engineer, and if you stay where you are you'll have the satisfaction knowing that you busted your tail doing all you could.
Specific thoughts I have are making sure the drums are set up in the direction that gives the best sound. For example, it may make sense to set up the drums facing one way, but it could sound better if they are rotated 90 degrees, or even 45 degrees. That, plus the wood and room ideas above could help you.
Finally, remember many many many "top" names started off with the same constraints you're fighting with. Don't let it discourage you - but don't beat yourself up if you can't get Ocean Way's drum sounds where you are.
Best wishes,
GH