surging flush; overflows rim
Try pushing down the tank flapper by hand as soon as you see that the toilet is going to flush normally. Not to say you need to do this forever but this will better reveal a need to check for clogs in the drain pipes or drain vent pipes.
tHE FLApper staying open and large amounts of water continuing to flow from the tank to the bowl after the flush is complete is normally just a waste of water. The bowl should be able to drain whatever the tank delivers without overflowing.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.