hoods mostly
drops for power climbs, downhills, and windy situation
tops for climbing and aero-tuck
elbows narrow on tops for TT
elbows medium on tops, palms upwards, hand holding onto derailleur cable for TT
no hands when i feel like resting or goofing off

For all you sram users, how stable do you find your bike when doing the invisible aerobar? for better or for worse, i can hold the exposed shimano derailleur cables for a little bit more control