I have both scenarios you described with some canes larger than 1/4 of an inch and growth near the top and some with very small canes and growth near the bottom. I had lots of leaf damage last year from Japanese Beatles and will work harder to keep this in check.
Here are a few pictures:
A Cab Franc slacker with very small cane and growth near the bottom
The biggest Cab Franc with nice size cane and growth at the top
One of the Traminette with fairly good size cane and growth near the top
The worst of all vines a Traminette with only a small amount of growth near the bottom...but I hope it will make it. Weeds near the vines are bigger!
Here are a few pictures:
A Cab Franc slacker with very small cane and growth near the bottom
The biggest Cab Franc with nice size cane and growth at the top
One of the Traminette with fairly good size cane and growth near the top
The worst of all vines a Traminette with only a small amount of growth near the bottom...but I hope it will make it. Weeds near the vines are bigger!