Instructor feedback isn't required in this situation since it is a gear setup problem.
Anyway, ditch the weights on the al80's, you are putting the weights there to try to get them to act like steel tanks, which they aren't, and shouldn't be treated as such. This rig was not designed for AL80's, so you are having to make the 80's act like steel tanks to get the rig to work as it was designed. Put d-rings fairly far back on your waist strap and another set down low similar to the Razor style location and use their lower attachment system if you are using AL80's, or try to find steel tanks of some sort. AL80's are idiotic tanks for backmount because they are heavier than comparable steels on land, hold less gas, and require extra weight on the diver to get them neutral which results in almost a 6lb dry weight disadvantage and 20cf gas disadvantage when compared to LP85's. The razor is designed around them because they are basically all that is available in Mexico, and the one advantage they do have for sidemount is you can don and doff bottles super easily like in the Toddy system. Don't use aluminum when you can use steel unless you have specific circumstances where the ability to pass bottles around is required. *I'm not really aware of any, but that's another subject for another day*. If you want to keep the SMS75, then I suggest moving to steel tanks if at all possible, and if not, at least rigging the bottles like the Razor guys and attaching it to the hips instead of the butt.
Aside from that, your suicide strap doesn't look particularly comfortable and I would move the attachment points to the 4/8 position on the mouthpiece if you are zip tying it in. That's just me though
