Good things happen to those who wait. Remember with any solid fuel, time is your friend, if you have enough of it!
It AIN'T rocket science that your home will require a good deal of time to come up to temp, however as you know, the inverse is true when warm. I'd guess you are using nearly all the BTU's available to restore 'normal' to your home.
I recall a new boiler install two weeks ago where it took 12 hrs to warm every corner of the house. The house was at 33 degrees. No heat at all this season. The copper thieves had been there ahead of us. What a PITA!!!
A day to reconstruct, then light off the boiler. KA-6....Went home at 9 pm, back at 08:00, and the house was up to 68 degrees everywhere, even the second floor
(with no baseboard replaced yet). Burned 70 lbs of coal overnight...not bad in a 3250 sq ft house.
The boiler was on the timer when we got there in the AM, anyway. Superstor went from 50 degrees to 120 in 10 minutes. (40 Gallon).
I think you are picking up what we a re putting down....close to perfect, but slow and steady wins the race EVERY TIME!!!