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Your connections are probably ok but I'm trying to rule out either a dirty filter, (that would restrict fuel flow), or a leaky fuel line, (that would weaken the supply). You could also have a fuel pump that is just starting to go, and they are cheap & easy to rebuild. I don't know what you have for an engine but you probaly have a small filter that you can clean.

You can decarb with Seafoam, Berryman's B-12 or Techron, and the outboard manufacturers have some branded products, but they all do the same thing. There a couple ways to do it, spray into the carbs or run a rich mix from a tank. Running the mix from a tank is by far the most thorough method. I call it Bigshots/Tohsgibs method, that he learned from a Yamaha Tech.

Use any small gas tank you have around and take that fuel line you are about to throw out and remove the tank end fitting and put the hose right in the tank.

Take a 1/2 gallon or less of gas and can of either Techron, Berryman's B-12, Seafoam, etc and mix them together(add proper mix of 2 stoke oil if not injected). Put gas line in tank and let engine run at (slightly) high idle until mixture is near empty but still in line and carbs. Raise engine & remove plugs and pour/spray some cleaner in each cylinder. Turn the flywheel to work it into the rings. Put the plugs back in finger tight and let it sit overnight. In the morning pull the plugs and spin the engine so you don't hydrolock it and put the plugs back in. Hook engine up to regular fuel supply and start engine and run it until the smoke clears.

Some people run it a bit and shut down for 15 minutes, then repeat & repeat. That makes sense to do once at first, to give the mixture a chance to work on the worst of the goo. As far as letting it set overnight? You can run the mix in the morning and then run the boat in the afternoon, same thing. You just want to give the solvent enough time to do its thing. Too much time in between is not a good thing.

I'll tell you right now, it makes one hell of a mess, so don't even think of doing it on that nice clean driveway of yours. You could back the boat right into the water and leave it on the trailer. Run the mix through and go home. Whatever.

If you are still having problems you could try to back out the jets 1/8 of a turn. I'm not a big fan of adjusting things until I am sure the basic things we have been talking about are ruled out, and the fuel pump is still an unknown.