According to the website the LT25 has a 44 inch transom. The Towee specs don't list transom width but its beam is 52" at the widest point (4 inches narrower than the LT25) and it looks to me like the transom on the Towee is a little narrower than the beam width at the center. So at most, I would say the difference in transom width is 4 to 6 inches.
Is that really enough of a difference to make a jet drive completely stop working? I wonder if it's possible that your jet was just set up in a way that adversely affected performance?
Pure speculation on my part but I'm having a tough time imagining that a couple inches of transom on each side makes the difference between a boat that gives excellent performance with a jet drive versus one where a jet won't function at all.
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