Here are a few pics of mine when new as I also had reservations on floor fitment! Has got slightly better with use but the central 'V' hinge on mine is still drum tight and inhibits the floor edges tucking under tubes without help from the straps - not ideal for longevity. Mine seems to work OK out on the water but still can't shake that niggling feeling floor is not quite right.....especially as Fenlander subsequently had his floor replaced! As mentioned by others this is a premium priced product so so everything should be a perfect fit.
I can sympathise with your concerns but looking at your pics the central hinge isn't stretched tight so scope yet for floor to pop under tubes. Gap at bow is normal and hopefully marks on pvc will dissipate.
Hope you enjoy your new boat they are awesome out on the water. 👍