I compared a few measurements to my other bike, a 54cm Trek Crossrip, and found that my saddle-to-bar distance was about 30-35mm shorter on the Giant. Part of this is the difference in top tube length (supposedly only about 9mm shorter on the Giant, but my measurements showed closer to 20mm shorter). The rest is probably saddle set back and small differences in the stem length.
So, the.medium Giant *is* a fair bit smaller than the 54cm Trek.
I've move the saddle back again and tested for KOPS and dropped a plumb-line from my nose to the bars - pretty much aligned. Saddle height is at maximum for comfort, but I won't lower it unless I feel discomfort after a longer ride.
I tested my balance "hands-free" in the drops and was able to hold the position with only minor pressure on the pedals, and it was easier to do this after moving the saddle backwards.
I seem to have a reasonably comfortable, but considerably lower, position on the hoods with my elbows bent 20-30 degree, so I'll try riding in this position and see how I go!
Thanks for all your input.
John
Last edited by johngwheeler; 06-01-17 at 07:27 PM.