pedestal sink drain leaking
Since you raised the floor level, it may be that the pipe is now too short and the slip connection is does not have enough pipe to seal. Are you sure the gasket is in the slip nut? Could have also cracked. Check these things out.
I like flange extenders versus using multiple wax seals. It is common for a double seal to slide when you install the bowl and either cause a leak or block the drain opening. Check the package on the new wax seal. many are including new longer closet bolts. If not, you can purchase them seperately. Good luck on your project.
If you have never made a mistake, you haven't done much.