Just increase the length of the chain so the flapper valve does not have time to close too soon.
SOURCE: Toto Dartmouth toilet flapper/chain design flaw
Your right this is a poor design. Space was the main reason for this and functionality was sacrificed. However, you can get a replacement rod at a major plumbing store. You could rig it by attaching a stem to the valve assembly. Allow the chain or rubber piece to slide over it. It is kind of like putting a permanent finger in the path of the chain to give it a "direct" lift up. This would then force the chain to go up instead of at an angle.
SOURCE: Replaced toilet fill valve - now bowl water level a bit lower
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.
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
SOURCE: my toto toilet flapper comes down too fast not
Shorten the chain link so that when handle is pushed down the flapper stands more upright. Dont shorten to much so that it wont seat all the way either. Good Luck and a Great Day. Please rate 4 THUMBS UP if this was helpful.
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