Couple of housekeeping tips:
Each time we reset a commode we use a new SS braided line with a loop to eliminate stress on the fitting. Usually a 20+" line. Avoid a neat looking short line, no margin for bowl movement. When starting the nut, carefully be centering the hose on the seat as you tighten to ensure a correct seal.
Do not over tighten the bowl nut otherwise you may have a problem with the float. On standard commodes it does not hurt to replace the float valve. Always check finished flange height.
Extra thick wax ring with a horn and 5/16" (not 1/4") flange bolts make the job complete.
