Sorry to hear about your issues.....my cousin has the Alligator Tours and that is the boat that got me into the nitro airboatR/C game. I flipped his also...the hull on that boat is to narrow for the power the Super Tigre .34puts out. When turning.....you have to slow it down considerably and it does not like choppy waters very much. As for your other two boats......back to the bench....I have been there and done that quite a few times with my Aquacraft Airforce....had a lot of engine issues which are now resolved. But at times I became so frustratd, I was ready to sink the boat and throw the Tx in with it....that is the nature of this hobby. If you keep at it with enough patience and some money....it will pay off in the end.
BTW...cool vids of Logan's boat!!!!