No point in buying the Exotek ones now, not unless you're after a more set and forget thing.
The Kyosho hangers are cheaper (only need 3 to have the whole range of adjustment instead of 6) and offer more adjustment options.
Just ordered the RF and RR for rear motor myself.
I have a similar issue with lack of traction on a damp clay track that brings sand through to the top, everyone has the same issue but I just push in the corners heaps and the rear steps out quite easily, on 17.5 blinky.
Using holeshots M3 front and rear, narrow rear hangers, short wheelbase, 30deg kickup +4 caster, stock springs (have losi low freq springs on the way) and 22.5 rear and 25 front with ghia 4 hole, +.5 toe.
Shorty pack towards the front (move it rearwards and very little steering), a full size pack makes the rear swing around much easier.
Track starts to get better when we get into the warmer months though.