just for interest, i trained on the 2012 ast 25' ace which had me do very very well. seemed to glide for ever and well just sat in the water really nice next session tried the carbon version licking my lips.
for my not as good. i had to paddle it at higher rate because i felt it didn't glide as far as ast. seemed like it slowed down unless i kept the rate up. it was more nervous too.
probably goes against the gain, but i preferred the ast.
both mick debetta program sessions were about 8.5 k distance at high intensity race pace sets- they hurt