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Replaced toilet fill valve - now bowl water level a bit lower

I recently replaced both my toilets' fill valves and flappers to resolve some running water/leaking issues - which was fixed on both toilets. The toilets are Kohler 1.6 gpf models.

But now my problem is that the bowl water fill level is about an inch lower than it used to be.
As soon as the bowl is finished filling (which seems to be at a normal level initially) - the water level immediately drops about 1-1.5 inches and then stays there.

Here's the things I've tried from other research without much success:

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I don't see any external leaks around the toilet.

I’ve checked that the flapper chain has enough play for the flapper.

I've checked that the fill valve hose is positioned correctly.

I've raised the fill valve floater to as high is it can be while maintaining the water line to where it should be.

I've tried ''slowing'' down the water fill by turning down water pressure. Some say a tank that fills to fast won't allow the bowl to fill to normal capacity.

I've checked the little holes along the toilet rim and they seem to not be clogged/blocked.

I've forced the trap to clear by turning off the water while pouring multiple gallons of water down the toilet which flushes with good amount of force - so
there doesn't seem to be any clogs there.

I have not checked the vent on the roof to see if it blocked which would might cause siphoning in the toilets - but I don't think this is it because if it was - wouldn't the water level in the toilet bowls drop much more? The drop in level I see is relatively small - but still not as high as it should be.
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I used the Fluidmaster 400A fill valve kit and
flappers as the replacements on both Kohler 1.6 gpf toilets.

I'm running out of ideas, any suggestions on what else to check or what could be the cause?

Thanks

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Put some water in with a bucket. poor some in slowly until you get it where you think it should have been. If it levels back out at the lower level. Then there is nothing wrong. Maybe the leaking water was keeping the bowl water line high than it should have been.

Posted on Jul 26, 2009

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First off,If the air vent was clogged the toilet would back up and overflow and when it did flush, it would make a gurgling sound.
secondly the water level in the bowl is not important as long as it covers the opening,The water is only there to keep out sewer gases so they don't enter your home and the shape of the trap will always maintain the proper amount of water needed to prevent this.
The previous water level may have been due to a partial clog that has since been removed.

Posted on Jul 26, 2009

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SOURCE: Toilet Bowl Water Level Slowly Drops

Check the fill tube in your toilet one easy way to see if it's leaking is get food coloring and pour in your tank to color the water this makes it easier to see and squeeze the tube in the tank when it's full if you see the colored water running down the middle of it you have a winner! if not you can look around for it sometimes the plastic under the flapper gets cracked too

Posted on Aug 01, 2009

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