My previous "into the sidewall" deck screws felt WOOD all the way up, for both the pilot holes and the too-short deck screws themselves. As it turns out, this was entirely through the floor alone, the short screws never reached the sidewall at all.
I think that my proposed "through the floor, inside from the wall" bolts are unnecessary, the "up into the wall bolts" can handle it all if they are much longer. I am able to buy AWG-10, 4" deck screws in a 10 minute drive to a local big-box store, upgrading from the currently used AWG-9 2-1/2" versions.
I will guess that think my large number of those screws will be sufficient, with no added interior "helper" bolts at all. And, if they they strip out, I can still upgrade these bolt paths into the framing wood by drilling out my L-bar holes, so that they can accept AWG-12 deck screws (an unusual EBAY order with delays) or 1/4" lag screws.
My "100 lb" struts are probably too powerful, but I'm going to try them anyway.
