i hate to point out the obvious (too me)
the way you have the blocks under your frame is how people in this hobby get killed.
look around at any home with a block basement or any mobile home sitting up on blocks
while i don't recommend them for any truck use, blocks have no strength the way you have them under your truck
when, not if, they crack they will fail catastrophically. where yo had two 8'' tall blocks will now be 1 inch tall
if you insist on using blocks at least turn them like a mason would use them
(hint) stack them like the 2 blocks behind your frame, not like
all the blocks under your frame