Toytec 1.5 AAL with 5100's

Guys I know this topic has been beaten up and back down but I need some advice. My mech installed the AAl and the Billies today. Set at 1.75. Still a good rake. I want to get close to level. The ride isn't much different than stock. Rides like a truck, all good. I know the AAL will settle a bit, so.
Should I put the Eibach Coils on so I can get the Billies cranked down to .85 for better ride and the consensus seems to be that will make it nice and level?
Should I set the Billies at 2.5 and be done with it?
Do I need a differential drop kit?
There is no vibe that I notice, I'm waiting a couple of days then bringing it back for final Billie adjust and alignment. Again this topic has been hammered but I do appreciate the advice.

 

I wouldnt reccomend preloading coils if u can avoid it...eibach 620s are much firmer than stock already so I dont know if u rlly wanna preload em.
Ive ridden in a truck with the toytec "ultimate lift" and it rode rlly rough and I dont think its worth the money...that said, I dont think preloading the eibachs would ride as good as getting longer OME coils and OME shocks in the future OR a better setup.

throw about 200lbs of play sand (bagged) in the back over the axle for a month...it will settle some. Then u can re measure.

also make sure ur AAL is installed correctly......some shops throw em in backwards