Hi there and welcome!
Honestly this all sounds about right to me. You just put about 11 pounds of meat in your smoker. At a smoker temp of 275F running unwrapped and not opening the door at all I experience just over an hour a pound before brisket or pork butts are tender and therefore done. You are smoking at a smoker temp around 225F so yeah it would still seem to me that you things are about on track with a while to go.
Another thing you have going on is that you have the meat on 2 different racks. The temp at the different racks is likely different. It could be that the brisket on the lower rack is absorbing most of the initial heat and doing some deflecting of airflow and heat so that the pork butt doesn't get as good of a blast as the brisket is getting.
This kind of smoke will tell you a lot about your setup and is unfortunately just one of those learning lessons we all kind of encounter at some point or another.
You picked 2 cuts of meat that actually don't care what temp they are smoked at so in the future you can definitely bump up the temp to 275F or higher even if you wanted and you will get the same or even better results.
Once you get this kind of smoke figured out and what a rough timeline looks like, start planning a smoke like this to END at least 4 hours earlier than when you plan to eat. If it ends 4 hours early then you just double wrap in foil, wrap in 3 bath towels, and leave on the counter and 4 hours later it will be piping hot to serve and eat!
If you don't actually finish 4 hours early then you have 4 hours of buffer time to hopefully finish the smoke before becoming late. Either way you generally come out a winner :)
I hope this makes sense and the info helps some :)