High pitch shrill when flushing

shut off water supply. flush toilet. There will be a little left .You can vac out with shopvac if you must.

After flush the system must close the hole which lets water into the toilet. If it does not close after flush, it is continuously letting the water thru. Check if it closes after flush and allows tank to fill.

Adjust your tower to let the bowl fill up more.....google your problem if you dont understand...depends on what kind of tower you have....should have teeth on the tower itself to make it fill more...try pulling up on the float...

Welcome to the world of 1.6 gallon flush toilets. You have already done everything that can be done to help the problem and no you are not the only people having this problem. This is just the beast!
They have had this problem with these 1.6 flush toilets from the get go and have come out with power flush toilets to fix this but hold on to your wallet. There are some toilets out there that work better without the power flush made buy American Standard and Kohler but they will run you more then the Jacuzzi.
Sorry I wish there was a better answer to this.

Check to make sure that the bowl fill tube is in the overflow tube. Your description sounds like the bowl starts with less water than it should have, so it has to fill up before actually being pushed out.

Sounds like something fell into the hole while the toilet was removed - maybe a teddy-bear? Remove the toilet and use a snake.

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Check this web site out I hope it will help.

you have to take the whole toilet out. you need to check the opening of the down pipe. most likely the wax ring is blocking the soilds. shunt off the water drain out the toilet, unbolt the floor bolts and left it up. clean out the down pipe and replace a new wax ring.

If very little water is used on initial flush, The bowl is functioning as a tank for second thorough flush. The high water level cannot stay high in the bowl while in motion or you would have a mess ion start and stops.