I would contact BradR on here. He had a LT an it was taking on water. They said they where having problems with them taking on water. I think.
I actually had the Jackson Cuda Lt and it was about 13 feet long and 32" wide as I recall. It leaked from the get-go and some of you might recall that I ended up having it replaced by the factory with a Big Rig.
Greg Blanchard has quite a few videos on YouTube in the Native LT and he says it is the fastest pedal kayak he has been in. I can't recall whether he stands in it or not. But, even if Greg does, he is a smaller guy I think and it won't be easy.
Thermoformed hulls are two pieces glued together and I think one issue relates to the flexing of the top piece under load, an angler wiggling around in one. I decided with regard to Jackson models to move away from it though I'd have no reservations buying one from Eddyline or another.
I have a Slayer Propel 10 and it is much more stable than the Jackson Cuda Lt and I'd guess it'd be much more stable than the Slayer LT. If you plan to stand, go with the 10. I stand in my 10, but only in calmer water situations. In my Big Rig, conditions don't matter. In my Meyers Sportspal canoe, I could do handstands and back flips.
Hey! If standing is not a big deal, take a look at the Eddyline Caribbean 14. It weighs 50 lbs. and, yes, it is a paddler but with that length and narrower width, it'd keep up with most pedal kayaks.
Not sure if the Slayer LT has had water leak issues or not . . . haven't heard that.