From what I have heard, EMGs are the least sensitive to body wood.
About EMGs sounding hollow, you must be talking about the 81.
The EMG 81 has very less bass because it is designed for high gain. The bass reduction makes the pickup very clear (not muddy) when playing metal through a high gain amp. This pick up is hence not the ideal Jazz/Blues warm tone pick-up. Also when playing fast rhythm passages, this pickup keeps the percussive nature of the tone intact (like the final segment of Metallica's One).
For good cleans/blues tones, try 85 or 60 in the neck. 85 is pretty dark and lo-mid heavy pick up, an exact compliment of 81 (like the clean/low gain solos in Ozzy Osbourne's "Old LA Tonight"). 60 is a lot more well balanced pickup with the best clean tones of the lot (like James Hetfield's clean tones).
If you are totally into warm tones and don't care for a lot of hi-gain shred/rhythm, you can also try the 85 in the bridge. I haven't tried this but from what I have heard, it is pretty cool.
** Disclaimer: All examples given above are gross approximations of what the pickups should sound like. These artists use a hell lot of other (hi quality) gear and the engineers do a lot of work to make them sound like they do on record.
-- My current rig
Guitar: '98 MIJ Ibanez RG520 QS w EMG 81/60
Amp: Laney LC15R Tube, Fernandes 20W SS
Pedals: MI Audio Tube Zone Overdrive, Boss OD3, CS3, MT2, HM2, DS2, CE5, DD7, TU3, Beta Aivin DD2 Delay, Dunlop Crybaby 95Q, Stranger Vol Pedal, BBE SupaCharger
Others: Yamaha RBX 374 Bass, Yamaha MM-6 Synth, M-Audio Fast Track, Shure SM-57, Heet Sound E-Bow Plus
Wanted(pm if selling): EB VPJr/Boss FV500L,Ibanez w Original/Lo-Pro Edge