Perhaps get ones with a good bit of adjustability lengthwise and figure out what works via trial and error. I have some old oval ones on a road bike, and they're great for races like savageman.
How is the adjustability with the Profile Design T2+ and T3 ?
The Profile T2/T3 are very adjustable -- you can rotate the aerobars and armrests up/down (around the basebar), tilt the extensions inward, the armrests can rotate around the extensions, and there is a riser kit so you can pedestal the aerobars off the basebar slightly. You probably can't get the pads touching each other if you're looking for something really narrow, and I don't think the F-19 armrest shape is all that great (they're very 'flat' feeling) and the pads kinda suck. The F-22/F-25/F-35 armrests might be better.