at a high chain without double cp i do see 20-30k on apex with rings, with the double, the cap i've seen at 65535, but with trizek that won't last more than 2 mobs anyway
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Using the Trizek as an example the (max) bonus is 30k at a 150% rate. Which means 20k actual CP + 30k bonus for 50k total.
This does indeed double during double campaigns. to a max 100k total. (and it says words to this effect in the blurb accompanying the start of the double campaigns)
I found on mules when spamming the Echad rings for easy xp at level 99 during the campaigns, to pick mobs that typically gave me 30k per mob xp. This meant I could get 4 mobs out of the ring and a total 120k. Because the third mob didn't quite take it over the 100k max.