Oh boy. Isn't some other part of your anchor system going to fail before the forward cleat gets ripped clean through the wood and out of the deck? At least the anchor is going to drag.
I do think it's worthwhile to put in new bolts and add a larger backing plate.
I got some 1/4" aluminum too Craig. Nice fellow let me have some from his scrap cutting bucket. Lifetime supply. Never hurts to ask.
Now how do I cut it? Angle grinder?