I just did a back to back test as well and the FS won the battle. It's 6 lbs heavier than my HT and on the rougher climbs I was actually quicker on the FS. The HT was quicker on the smoother climbs and my HR was just a little lower on the HT. Maybe I'm not quite good enough to get the full benefit from the HT. I definitely felt fresher coming off of the FS. Actually just got back from the LBS looking at the new light weight FS bikes out there. Hopefully there will be a new addition to the garage soon!