yep, weight is a big issue. have btdt, fly in, but flying out its smaller trips to bigger water, to reload everything where you have enough runway to get the thing climbing positively.
Takes a lot of work and time though.
Better safe than dead for sure.
Good friend of ours had the same experience with a stinson load a month ago. We picked em up off the home lake on arrival, and he said lots of puddle hopping to get it all to one big lake and reload and fly.