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elbeau said..
Maybe it is me?
Most probably, it is neither you nor the board, but the combination of the two. I guess you should try more boards, if possible wildly different, and try different techniques.
Stability is a tricky subject, for instance too much volume can make the board less stable by a "cork effect". And thus, if you are on a board with too much volume, you will never want to try a board with less volume because, since you are already feeling unstable on such a board you imagine it would be worse with less volume.
For example, at 100kg, my first true SUP board was a 9'6" x 155 liters. But I used it only 3 times before switching to a 8'11" 140 liters because I was frightened by the cumbersomeness of the 155 liters boards and was afraid to hurt myself when waves were a bit steep (in the mediterranean sea... a big lake). Seeing that the smallest Atltantis Runway is a 9'6"x152 liters board, and you claim to have years of experience, I guess you suffered the I-dont-dare-try-smaller-boards syndrome, and this has stalled your technical progresses. We all suffer from it, for instance often I did not dare get on my smaller boards if there was a bit of chop, but I discovered that you can actually use them, if you adapt your technique (e.g: feet closer to the stringer, staggered stance, ...). A 10' x 26" x 100l longSUP is insanely enjoyable, you get the speed and power of SUPing with the nimbleness of a prone longboard. Granted, it is more tiring to paddle than a 150 liters board, but it is surprisingly stable, as the deck is underwater and not pushed around as much by the chop.
It is a kind of chicken-and-egg problem: you must challenge yourself a bit to progress and be more at ease. But not too much as to prevent your progress because it isn't fun anymore...