Well, IMHO unless the tapes literally cannot be fastened the diaper is ok on size. even if they touch in the middle and/or even overlap a bit.
It takes a while to know how on your body to get them to fit, currently my tapes are about 1.5-2" from touching, i could go down a size then that also means less side coverage of the padded area and less capacity overall too...
Some diapers no matter the size didnt fit me well an leak, but for me megamax and before the molicare fit the best, most the AB diapers never would fit right and store brands are not an option IMHO.
I am IC and have been nighttimne in diapers since birth, so i have a bit of experiance...
I will also say that when my ex used to do my diapers (she is a nurse) she could do it way faster then i could for sure, like 5 seconds and done, but my hands are not the best either, but that said, gotta get the sides smoothed out around the sides which isnt easy, and get the tapes centered and snug and in just the right place.
I have done others diapers too and i think its actually easier to do someone elses diapers than doing your own, they are not as easy to do oneself, think they are made for another to put on
But, also in hospital they use large diapers for the same reason i think too, less leaks, less work....even though they are not super capacity, they change them like every wetting, i think it was like every 2 hours when i was in the ICU the whole time i was in, other than when i had a cath in (was in coma for about a week).
Bigger is good for a lot of things