I did some testing with a few athletes (road) a year or two ago, Sphinx was faster than hoods for everyone, but when it got into drops it got a lot closer. One athlete was faster in the drops than Sphinx (although he was the most aggressive in the drops... elbows bent closer to 90° - so really just a lower sphinx position.) For track, if you could get the bars in a position where it was semi-comfy to have that position in the drops (probably would require raising the bars actually and holding them higher into the bend of the bar) it would definitely be "safer" and maybe just as aero.