If you are swapping jets without reading the plugs to find out where you need to be you might as well be throwing darts at a dartboard blindfolded. Only other way to tune without reading the plug is to put a wideband O2 sensor on it and even then you want to read the plug until you know the gauge reads right and is where you are supposed to be.
If you are indeed rich like you think putting a bigger jet in it only makes it richer. You need to read the plug, find out, and adjust jet size according to what the plug says. Reads rich it needs a smaller jet, reads lean needs a larger jet.
You can pick up a set of jets for cheap and have any size the buggy will ever need.
https://www.ebay.com/itm/10pcs-Carbu...72.m2749.l2649