Photo 4 an 5 - what caused this and how exactly am I supposed to fix it.
Andy would say running gear problems in the past
I did a quick check and see no photos or commentary about your 27's shells entire outrigger - floor - shell condition. How are your outriggers?
My 73' had similar partition damage and I eventually found it had terrible outrigger damage: From accidents with a few folded up and even replacements with busted welds; rusted out pieces, failed & missing shell hold down bolts, flooring damaged by dry-rot and no longer holding the shell C-frame since it had softened.
If you have outrigger damage the flex is transmitted elsewhere, might be the other side and ten feet fore or aft but the movement is telegraphed elsewhere.