Dropping to two pumps/day

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Currently pumping 3x a day (exclusively feeding expressed breastmilk). 
I usually pump at like 8am,sometime between 2-4pm and then at 10:30/11pm.  I'd like to drop to two pumps a day (at 8am and 8pm). I had tried just dropping the 2-4pm and pumping at 8, but the issue is my breasts get really full and painful overnight. I think one breast is maybe clogged too.
Any advice on how to best do this? I was able to just drop sessions with my first daughter, but my body doesn't seem to want to cooperate this time....
**i know my supply might drop and I'm okay with this. I plan to supplement with formula if necessary