I checked out the Fowler / Goshawk Ridge loop. It's just west of the Springbrook loop, closer to Eldorado.
I might like this trail better doing it in the opposite direction -- it was
really steep for quite a long time and I eventually had to walk about a quarter-mile or so at the top.
Also, I stopped a few times to take photos, check the map, and drink water, which added to my slow overall time.
This elevation profile doesn't seem especially accurate, since I started and ended in the same place.