ARB EL112R leaf pack Info?

I have a few questions and would appreciate some feedback about the ARB EL112R pack. It's probably a bit too late since I just installed them but here goes:

I've been running CS047R +

$82 D29XL Leaf Spring

D29XL for over 10 yrs (220K km). Broke the second leaf on the drivers side a couple months ago so I replaced with a pair of EL112R's. My old pack, coupled with air bags and BP-51's was perfect for my use. Constant load of 300 lbs and 1/3 of the time I have a load of about 1000 lbs.

-Is the EL112R comparable to the CS047R + D29XL in terms of stiffness?
-Is it possible to add the

$55 EL46XL ARB XL to Suit El095R 96R

EL46XL to the EL112R? If so, what part #'s are needed?
-Is a 3 degree shim recommended when using the EL112R? It completely stopped the vibrations on my previous setup and I transferred it to the new pack, hopefully it was the wright decision.
-Just an observation, as I only have about 50 km's on my new setup, but I don't like the space between the leaf's. The pack makes a "W" with just my 300 lbs load. The clamping of the airbags doesn't help this either.

Hopefully I never have to replace my rear suspension components again, I might of used a few Quebec swear words breaking some of the rusty bolts making the job 3X longer than needed