I'm doing no such thing. There were waters and some mountain peaks covered. The Bible doesn't say, "And then, the mountains never got higher." YECs started down this road thinking about sediment left by the Flood and the shaking of the Earth off a straighter axis...
...I wholly accept the time frames given in the Bible for the Flood.
Then you have a serious and fatal problem with your story:
Either you accept MAGIC that *poofed* enough water into existence and then *POOFED* it away again?
Or the world was flat enough that the observed water would cover the highest mountain by several cubits (as the bible claims).
If the world WAS flatter? You would need 100-200 MILLION YEARS to change a flat world into the current world---
OR ELSE IT WOULD MELT FROM THE HEAT RELEASE.
The ONLY way the world flood could have happened is by using MAGIC-- to bring in enough water, then to REMOVE said water -- then to REMOVE ALL TRACES OF WATER-DAMAGE.
But wait! It gets WORSE: MORE magic to *poof* back the plants that DIED from the flood-- Noah took no plants... but the story demands trees after the flood-- MAGIC?
MORE magic to POOF all the different species we see today-- Noah could not have taken them all.
MORE magic to POOF back all the DEAD OCEAN LIFE-- the mix of fresh and salt would have KILLED ALL SEA LIFE. Noah took no sea life in the ark.
MORE magic to POOF AWAY all the decaying carcasses that would have POISONED THE EARTH from all the rotting.
MORE magic to POOF AWAY all the SALT which would have POISONED THE WHOLE PLANET'S SOILS --- EVERYWHERE.
That's a very short and incomplete list of the MAGICAL POOFING REQUIRED.