I dove in Belgium regularly in the winter (Barrages, Vodelée, vodecée, villers-2-eglise, dour, Rochefontaine, etc.) with a Mares MR22 1st stage and Abyss 2nd stage, in waters down below 5c with no problems at all. I believe the internals of the MR22 are similar to the 62X.
You shouldn't have...