So this is not obvious by any of the pictures I have released but I have some missing L angle brackets that have yet to arrive from my order and some 2020 triangle angle brackets that are not mounted as well (because I have tooling lent out to someone I am trying to get back, long story).
Anyways. The reason there is so much sag is because the frame is sagging and not the actual design is having the major sag. When I can mount the actual metal corner pieces instead of the plastic temporary pieces then it will reduce the sag very significantly as well as make the whole machine properly rigid.
This has been a major relief for me because it does mean I don't have to enact any obtuse plan to really get the machine printing well and any changes I would make would be almost entirely cosmetic.