wacomme, that is what I am riding here, too.
I don't have a powertap, but I suspect that my ftp is probably less than and certainly not more than 250 (however I only weigh 128). For whatever this comparison is worth, I did 50 miles on Tuesday including Lookout (started the climb at about mile 21), and was able to maintain a cadence in the low 80's in the 25 on the climb.
I rode from Woodland Park to Deckers and back today. While my 39/25-27 was sufficient climbing south out of Deckers on 67 for a level 2-3 ride, I occasionally slipped below 80 rpm. And while the 34/25 is even lower than my 39/27, perhaps I should stay with a 27 or 28 in the rear - even with compact gearing. Only wishful thinking makes me stronger than I am.