Originally 8 at Elmo too, IIRC. There is another on order (P-223) to bring PAED back up to 8. Maybe the ochos are a PACAF thing.
TCM has 4 active squadrons - the 4th, 7th 8th, and 10th. Three reserves. CHS also has the SOCOM support tasking but I'm not sure if that is what makes their assigned iron numbers so much higher.
Those aircraft assigned numbers are always in flux; besides the usual tailswaps between bases there's airplanes that get peeled away for whatever reason; for example the 8 aircraft to Elmo all came from McChord's fleet (I used to work on a number of them). I know that skewed TCM's manning figures for a while, but I think with the higher production allocations some of the new-build aircraft have been slotted to replace the lost 8 at TCM and the manning would be back to normal. I have no idea on the timeframe of that, might have already happened, who knows.