A little elaboration on the system setup would be a good start, including how many rads, pipe size, boiler type, etc. Power flushing won’t work if it’s hard deposits. Is it balanced correctly?
The pipework is 22mm main runs reduced to 15mm to the drops then 8mm drops. Up stairs rads 8mm too. 15mm pipes to the skirting boards then 8mm from there to the rads.
You want to check the valves on the rads that are cold to see how good the flow at the valves is. As suggested they may be restricted so there's now poor flow into the rad, expcially if the system was flushed and the crap's got into the microbore and valves. How was the system flushed?
1. Was the system re-balanced after the flush? If not, the lock shield valves may have been disturbed during the flush, and the upstairs radiators be taking most of the heat.
2. Try shutting off the upstairs radiators on the TRVs or wheel head valves, and see if the downstairs ones get uniformly warm.
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