Well for me I think that the fin might even be too big for just a 7.0. Like you said I never really used the 137, I used mainly the 115 with a 7.0 and a 34cm fin. So that being said I would try downsizing your fin a bit. I use to use a Techtonics Tomahawk 34 but now I have been working with MFC on some new fins coming out soon. So we will see. I would try a smaller fin maybe something like 42, maybe even a Debocheit SL 5. Hope that helps a bit.
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