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Recently insulated back-side of parallel flow system, changed main vening, switiching-out MOM 1's on each main to Gorton#2 on back-side, and 2 Gorton#1's on front. Result, faster steam getting to end of main, but increased pressure and heat swings. Realizing we're in the middle of cold snap, single digits at nite, system seemed more manageable with no insulation and less venting. Thinking a 3cph t-stat might be appropriate. Currently have t-822d, and no matter where anticipator is set no improvement. Current setting is at lowest setting, which is higher than control unit Genysis 7505 amp rating of .1