Hello, I just realized I screwed up and installed the Ditra-Heat mat over a plywood underlayment using Tec Full Set unmodified thinset. The options as I see it are 1) rip out mats and reinstall with latex modified, 2) leave as-is and hope the bonding remains intact, 3)??? If the bonding between the mat and the plywood loosens slightly over time, is that really going to cause problems? The tile is bonded to the top of the mat and the whole system is designed for it to "float" so that tiles don't crack due to substrate expansion and contraction. So, if the whole mat is "floating" and the uncoupling membrane is not 100% bonded, what will happen? My feeling is that #2 would be a reasonable risk due to the time and cost of ripping out and redoing...curious to hear your thoughts. Thanks. (P.S. I'm not concerned about potential warranty issues).