put your close up mic near the rim where you would anyway, but then put a nice condenser above the tom using the 7:1 ratio rule (that's a whole 'nother topic relating to mic phase relationships, but if you are only using 2 mics to test this trick out it won't hurt your overall kit sound yet) crank the gain on the condenser (i'm thinking something like an AKG C414, AT4040, AT4050, or even a pencil condenser like an SM81 or an SM94, you get the picture) point that straight down on the tom. that condenser mic that's at about head level when you're standing up will pick up GREAT tom resonance. This is why using overheads as a KIT sound can be so important. it just sucks cuz you can't really do this with a drummer who is all over the place on his timing or really bashing the hell out of his cymbals. but this is where making triggered samples of that mic comes into play! get few dry hits of him hitting that tom, then make a sample of that resonance and keep that mic out of the final mix and just trigger that resonant sound with no cymbal bleed into your mix so every time he hits the close up tom mic, you're also hearing the tom resonate without all that cymbal bleed and clutter from the kit. all that clean resonance can be then brought up into the mix to taste and you'll instantly feel some of that boomy decay that you're searching for