Both were probably about right. Could maybe have gone a little taller for the first. Yeah it's tricky as I don't have as much experience or a frame of reference like I do for flat TTs, just tend to go off gut instinct. Upped my gear for the first after riding it yesterday on 68".
How was your gearing?
I'm always struck that picking a gear for hill climbs must be even trickier then for conventional TTs.