In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Concentric vents are terrible for these boilers. I strongly suggest having separate terminations for the intake and exhaust. I've seen several munchkin and Peerless pinnacle/purefire boilers destroyed by exhaust gas recirculation from the use of concentric vents.
I still install cast iron rads and cast iron baseboard. The baseboard is/can be a one man job in my opinion. I'm pushing 60 and still do it solo. Quiet, effective, and will last forever.
To this day, I'm still not a fan of residential copper fin tube baseboard. It's as close to forced air as hydronics get, except for fan coils of course.
The last picture above shows piping coming from the right side steam output of the boiler through a short header that feeds the steam main but the other end of that short main appears to be going down to the return and thus acting as the equalizer. From the left side we have a pipe coming off the other steam return(?) going up to the steam main.
That is a Dunkirk style boiler and they are VERY fussy as to how they are piped. I think that piping could be a large part of the problems you are having with steam distribution.
If you look at the manual you will see how it should be piped. Both steam outputs should be used and they have to be the same diameter as the steam outlets. The two steam supplies come first and then the two connections to the mains and last a pipe turns down to the boiler return acting as the equalizer.
I think the installer tried to use the old boiler header but didn't get it right.
Your supply piping from the boiler is not configured according to the explicit instructions from the manufacturer. Having the risers on both sides of the header with the takeoffs in the middle with no real equalizer is bound to throw huge amounts of water up into the mains., strangling the steam.
The lack of adequate main venting at the ends of the mains, (dry returns) prevents air from getting out of the mains so steam can get in. You are probably burning excess amounts of fuel (double?), to squeeeeeeze the air out of the constpated little openings of the radiator vents, a task for which they were never designed.
If you refer to the instruction manual, maybe you can compare what you have to the required piping.
What is your pressure? Has the boiler been serviced since the installation, with the pigtail cleaned?
Get some capacious main vents such as Big Mouths on the ends of the mains, and keep your pressure down below 1.5 psi, verified with a low pressure gauge, (0-3 psi). While the installer is doing that, ask him why he didn’t follow the instructions, so as to prevent a problem with the warranty when the boiler expires in a couple of years.—NBC