RT,

Nice fish.

To answer your question of girth in proportion to length; it's not uncommon. The O.P strain collectively can produce some real footballs.

Recently on a grays harbor river,I had a buck that mirrored your measurements and a hen that was 38 inches with a girth pushing 20 inches!!
Absolutely beautiful fish caught the same day. When the planets line up around here it can make for some truly exceptional fishing.