The amount of water used in the flush of the toilet is controlled by the flapper. Adjusting the water level higher in the tank DOES add a small amount of water to the flush, as the higher water level adds slightly to the head pressure at the flush valve, but not enough to make big difference.
Also, the bowl is designed to flush using a certain amount of water. Not enough, it won't flush well, too much, and you will be wasting water.
So I doubt that raising the water level in your tank will solve your problem, unless the installing plumber didn't set it properly in the beginning.
If your current flapper doesn't have any adjustment capabilities, you might try one with a float on the chain that you can adjust downwards to make the flapper stay up longer. That would be what I would try first.
The newer toilets with the 3" flushways and 3" flush valves tend to have a phenomenal flush, especially considering the 1.28 gallons used per flush, and are what I recommend for someone who doesn't want to worry about a clogged toilet.
One other thought. Do you have cast iron drainage piping?
Cast iron tends to build up scale on the walls over time, and no toilet will flush properly if the drain line is mostly clogged.
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