After going through several wet suit purchases lately and not being happy I have decided to go with the one I just bought to replace and augemnt my vintage sharkskin and worn out Body Glove. It is a Bare 5/4 Velocity. Here is my observation on wet suits as now made and the similar issues confront me in cloths and other things of this nature.-----
All clothing, wet suits etc seem to be built for men with skinny legs and skinny little wrists and big bellies and small chests. Any owner of a male body which is not pot bellied and with large butt and skinny appendages will run into issues.
Example, the Bare ML suit says it is for 33-35 waist, 39-41 wait, 170-195 lbs, 5-10 to 6-0 tall. BUT, I am 32 waist, 185 lbs, 44 or more chest and I have large arms, especially wrist and calf and ankle and I ain't got no belly so when I put the suit on it just simply does not fit correctly--it has to little where I need more and more where I need less--I suspect your running into a similar isssue in that yoiu have a taller and thinner build and all of the "belly material" that is added for fat guys is making the chest area to loose.
I have no solution other than paying lot's of money for custom made rubber suits that last a year or two and then stink so much they have to be burned to prevent EPA condemnation.
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