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1 pipe steam system problems

problem that is boggling.. this is a 1 pipe steam system with the main running through the basement and branches going up obviously.. 2nd floor has 2 radiators that are 1st off the main, 1 bathroom riser with a air valve 1 middle room and two far radiators.. 1st floor has 2 1st off the main, bathroom riser middle capped at the floor and 1 far.. the homeowner changed all the air valves about a year ago with quick vents.. the problem now is the 2 2nd floor far radiators dont get hot at all.. the middle very little..also, few radiators on the 2nd floor are banging.. the only way those get hot fully is if the thermostat is on high 80's and runs for a while which sweats out the 1st floor tenants.. the thermostat is in the middle room on the 1st floor with the capped radiator. i recently changed all the air valves according to the gorton chart and still the same.. checked the radiators for pitch and is ok.. what else should i look for? thanks guys..


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