Q&A for How to Adjust Toilet Tank Handles

You want the chain slightly slacked in a hole that's as far to the end as it will reach. This will use the highest part of the lever. However, your toilet's design is all that determines how fast and how much water rushes into the bowl. Consider getting a new toilet with increased tank and bowl outlets.

You can buy different flappers that close slower, or a flapper with an adjustment for the float rate.

Get a new and smaller seat or get a smaller or thinner handle. Bad toilet design is inexcusable in this century. Your only other option, if those aren't options or don't work, is to replace the toilet.

Nope. You'll have to try another handle. You can even try contacting the manufacturer and see if they know of the problem and/or any brands or styles that will help restore proper operation.