Join chat channel and type in chat LFG A1 splits and whatever level you want to farm. or start your own group LFM A1 Splits.
Split farm on T2 -T3 if you can handle it.
I find doing at least 6-10 caches if not a whole inventory Tab full gives best results, Put in at least an hour at a time. Or at least save up 10 - 30 and open at same time.
The level of the toon you collect the the bounty from Tyreal will also determine the level of loot in cache.
IMO normal runs are now a waste of time since the buff to caches T2 and up.
There is probably some merit to farming caches using Junger rules. But I've found it almost impossible to find 4 people willing to stick to the rules.