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Additional load is half a 2nd floor bay to the next joist and the upper wall load. Visualize it with tall studs and a nailer at 8' across the studs. The timberlocks will provide a little lateral in the hanger (diameter, depth, density and toenail factor) but the sheathing will do the job if it spans across the post. Another way to provide that tie is a strap from girt to girt over the post and hidden by the sheathing. A roll of Simpson strapping is very handy to have around, or repurposed heavy lumber banding in a pinch.
The angle of force I've usually seen drawn through materials is 45 degrees, gravel included. Superior walls install manual has some info. If it is only 6" thick the pier blocks would need to extend to within 6" of the edge to make full use of the 3' width. I've been wondering about a wire fencing lined gravel filled trench under each line with the wire wrapping the rock to retain it... a long gabion. Restraint is an anchor screwed through the bottom of the trench.
A little saw mill is high up on my priority list right now. We have so much white Ash that is getting ready to die from EAB. Tons of mature 20-24" DBH.Will you be lifting the timbers/LVLs on your own? I just lifted two 36' 11 7/8 LVLs by myself for the second floor deck. It would not have been enjoyable to raise those 30 feet up to a ridge beam.