-The rear ride height is to compensate for load (it is a light commercial vehicle after all).

-Die cast alu lowering blocks are perfectly good for rear leaf spring set ups. I recently bought a wrecked Gen 1 that had been lowered 2.5" all round (die cast blocks were installed and I don't know if solid steel blocks are even available). The front tires didn't show any signs of uneven wear and I can't see any shims on the control arm shafts to indicate it had been adjusted for camber so I think it's safe to say it won't radically alter front end geometry. There were no signs of tire to fender fouling and the wheels had been swapped for 14x6".

-Don't cut springs - just stupid and ruins the ride (plus they are illegal - springs must remain captive in their mounts)

-You don't need dropped spindles unless you're planning on a radical ride height drop. I doubt there will be a direct difference in handling with spindles vs springs but I'm not an expert on dropped spindles (or much else for that matter lol)

-Lowering a car or in this case a truck does change the centre of gravity which is the whole purpose of the process (unless you're into cooked rice and like to see an expensive bodykit get turned to confetti every time yo drive over a kerb )

-If you want to improve handling add bigger wheels and low profile tires - the most effective way to get grip. A decent wheel and tire package makes a massive difference.

-Guys have installed rear stabiliser bars on these trucks to improve lateral load shift between front and rear. Looks like a worth while upgrade.