Your Thrust Vectors have absolutely nothing to do with what you're calling a "rooster tail".
There are many things that could be the problem, including carting around another hundred pounds of water in the tube cover, as well as the tube losing inflation, the rider causing more drag than another rider, etc.
Your problems are a shotgun description of issues, and will be best solved with more information from you, and less questions as to what others' results are. Their results are for their boat, and you're needing to narrow down what's going on with YOUR boat. Symptoms will help to identify things, and you having fifty things to check the next time you are out are simply going to end in frustration, IMO, as you keep trying things to address the multiple issues, which may not have anything to do with the other things. Here is a "for instance":
Seams power is is fluctuating at times I have plenty and other won’t get out of its own way
What does that mean? Be more descriptive of what's actually happening. What does "fluctuating" sound like, feel like, is something on your gauges causing you to think this, did you just run through a weed bed or other debris, have you checked your impellers, do you have zero power from one engine or the other, if so, which one, etc etc etc.
Look at this like you're trying to pick out the killer in a police lineup. "seems", and "kinda", and nebulous terms like this caused you enough concern to hit us up, so tell us what else you noticed,
in detail, so we can track down the thief stealing performance from your boat.
Have only reached 42mph which concerns me when reading others getting close to 50.
You inserted this within the rest of your post, so I'm going to point something out - you're not telling us if this was when you were tubing, when it was glass calm, when you were last out, what temps were, etc, and those who have hit 50 may have had completely different conditions than you were operating under, and so on and so forth. Info. Act like your wife after a few drinks, and blather on endlessly about your boat - in this case, we LOVE to read it, and it's NOT too much info, EVER.
The rooster tail being the last but annoying issue.
Was it annoying because your riders were complaining, or...why was it annoying? What was the height of your "rooster tail"? That's the kind of stuff we could quickly and easily answer. I've got the Thrust Vector Wake. When using the deflector, I get what some might call a "rooster tail", maybe a foot high, that dies about a quarter of the way to the tube. I've also got a Y-rope, hooked to each transom eye, and a 60 foot 3/4" tow rope attached to that. Zero issues with towing a tube, other than at times, the tube's cover is filled with water and doesn't drain easily, so it's like adding a second rider.
What tube are you towing, how long is the rope, where are you attaching it, etc? If your friend is saying it feels like getting hit with a shotgun, that sounds like you've got a 20' rope and you're blasting him with the initial thrust from takeoff. Was this every time, only when he was on a certain side, into the wind, etc.
It just gets bogged down in turns so easily.
This is normal. You said this was your 7th time out. Are you referring to it "bogging down" when pulling a tube, or just in general, gradual turns, sharp turns, etc? This IS normal, but it will be more noticeable the sharper the turn is, and if you're used to a prop, and turning around a bit sharper to pick up a downed passenger, it'll seem even more pronounced.
Do this - take your boat out, hopefully without anyone other than the wife, if she wants to go along, and treat your boat similarly to when you were hauling a tuber. You should see similar performance, if not, that'll help us point out other things that might actually be related to the boat's performance other than a tuber strapped to the back.
Don't worry, you're still above water, and you found us, we'll either set you straight, or help you track down the actual issues you're having, and help you learn what's "normal" for your boat. We may help you spend some money in the process, but you didn't buy a boat for the investment returns, right? ?
