Leaking Prowler 15 - any more ideas?

Took it out for a test from the harbor to the lane and back in med chop, dry as a bone with the gooped hatch gasket.  A couple of days later, out from MBK all day, back through good chop, still drier than the factory hatch was.  I do get a little water puddling right under the seat, with just the edge of the puddle, at most 1/4" deep, overlapping the hatch- I think thats where the bulk of the water got into the hatch.  If I had a 6" hatch that was factory installed, and was getting a little water inside,  I'd take it out and goop up the gasket.
   One good thing about all this is that I now no longer suspect the scuppers as the source of the cup or two of water I used to get inside, when you stick your finger in the holes, there's a ridge of plastic an inch or so up from the bottom of the holes that looks like a seam, but looking from the inside of the yak, there is no ridge - I think there is no seam there, thats just where the round pieces of the mold that create the hole join on what becomes the outside of the kayak. Not that it can't be a weak point - I wouldn't use a cart that was held by a pipe up through the scuppers.

Stoked that you found the problem Tom. I second the thought of the through the scuppers cart pipes.

My 15 is a seive! I take water over the hatch, a lot through my flush rod holders. The hole for transducer and power cable leaks too with a wave over my lap. Never been too big of problem, worst day was about 2 gallons.

I hate my 6" hatch but was told I needed to have it to install the rudder.  I never use it and after this I think I will re-goop the gasket and seal the damn threads too!