It doesn't work that way. Good try and sound logic. Ok so lets look at 17" FW @ 10 watts per foot it maxes out at about 88ºF But the 4" 8 watts per foot hits over 125ºF max. To use one t-stat you need that same heat out put per length of flexwatt. Look at the power per sq inch if that is the same you MIGHT be ok. (17"@10w=0.59 4"@8w=2) The four inch gets about 4 times more power per sq inch than the 17 so it gets hotter.
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