I think the key switching off and back on fixing it deal is coincidence. From your initial descriptions, it sounded like fuel delivery but it takes elimination of the spark being the problem before you can go that route.
What you are describing is a loading up problem. It's actually kinda normal if you consider what all is going on when you floor it for a period of time and then let off the gas. That aside, what I would suggest to you is to make some adjustments to the air fluel mixture screw that sits on the drivers side of the carburetor.
First thing you need to do is determine how many turns (in 1/2 turn increments) you are out in stock form. So count how many turns of that screw it takes for you to bottom it out and use that for your point of reference (for example: 1.5 turns out). Then, try the screw with 1/2 turn in from stock. So if you were 1.5 out from stock, go with 1.0 turns out then go play for a bit and see how the buggy acts. If the problem gets worse, go 1/2 turn out from stock instead and see how that does (2.0 turns out total). Your goal is to find the sweet spot.
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