Hi guys getting my truck set up during christmas break

I've been reading this thread from start to finish for a month now and am on page 1860 so almost caught up

So happy I missed the whole exotek clutch debate, it was no fun reading thru it.
I have installed
Exotek LCG V.2 Chassis
RC SHOX V.2 Center Diff
Castle 3800 1410 SCT ESC
Savox 1258
Spectrum DX3S with cap on receiver/ so no glitching or brown outs.
RPM arms front and rear
Sway Bars White Front, Blue Rear
Shocks 32wt front 27wt rear
Yellow springs on front, Blue Front springs on rear
12mm Aluminum Hexs
Proline Flo Tek
I am about to tear apart my front and rear diffs and rebuild and replace paper seals and diff fluid.
I will be changing diff fluid to 7000wt Front 5000wt rear for center diff. My LHS had no Team associated 7000 wt diff fluid so I purchased Losi 7000wt diff fluid. Will this be a issue? It costs $3 more than Team Associated Fluid so hope it works
I believe wild cherry posted to use 2 paper diff seals on each diff and it will eliminate leaky diffs otherwise theres the kyosho grease I believe Mantis posted using.
Can I get away with reusing my installed diff paper seal if it isn't torn or damaged and just installing one additional paper seal?
I will be running on a indoor hard packed clay track that is damp, the tire of choice is Barcodes super soft. Can I get away with Barcodes in any other hardness.
Anyone have a set up they recommend for this type of track? Would the 8mm mod be useful to me?
I've used search, but found nothing on these 2 specific questions.
Will the paper diff seals from a sc10 fit a sc104x4
and
I want to shim up the diff gears to eliminate outdrive wobble.
I'm not sure if I should use the .5 washer some people have been using and team associated is sending out if you call them? or the xray .3 I've read people are using?
Can someone please tell me the dimensions/part#/link/ or easy way to find the xray .3 washers that people are using because when I asked for them at the LHS nobody there had no clue but tried to sell me 4 different kits because one of them had to have what I needed
I don't know which one is preferable to use xray.3 or .5 washer?
Also if I use the .3 washer its one .3 washer under sun gear on each side of diff remove stock shim?
I also read somewhere one .3 shim and leave .2 stock shim on other side?
I also read that putting 2oz/3oz of weight in front and sides of servo will help truck handling even with the exotek.
I am running a regular stick pack .