I'm not a heating engineer, but it sounds like your rads need 'balancing'.
Assuming that the boiler and pump are working (which they seem to be), that the pump is big enough to pressurise the system adequately and you have followed the advice above re bleeding air (and any crud - that should have come out with the power flush) as above, try the following:
First establish which radiator gets hot first when the system comes on, then the second, third etc.
1) open all the inlet valves to the radiators (hot pipe side) fully 2) open all the outlet valves (cold pipe side) fully. 3) leaving the 'last' rad alone, work your way back down the order to the 'first', shutting off the outlet valve by 1/8th of a turn (if you have 8 rads) on each rad until you get to the first, leaving this open by a small amount. 4) Run the heating system and see if all the rads get warm. Adjust the flow though the rads by opening / closing the outlet valves until all the rads are warm and at a similar temperature. This may take a bit of back and forth between rads to set properly.
Radiators are usually plumbed in in 'parallel' - imagine a ladder with the left leg being the hot feed side from the boiler, the rungs being the rads and the right leg the cold return to the boiler. Fluids under pressure (similar to electricity) will always take the route of least resistance, and the further away from the boiler a rad is, the more pipework that the water has to flow through and therefore the greater the resistance to the flow - hence, lowering the outflow resistance lowers the overall resistance of each individual rad......
If this succeeds... await huge adulation and respect from the wife/girlfriend/partner/boyfriend(?), point out how much money you have saved and that you can now afford that danglesprocketturbocarrier that will make your kart go 0.0001 seconds faster..result!
The alternative is.... think - 'sod this', open a can of beer, put on a jumper and phone a plumber on Monday - Who will charge you an arm and a leg, thus destroying any karting budget that you may have had for the next few months..
(apologies to any plumbers that read this...!)
Good luck - and finally, don't try this as it is going dark on a Sunday evening 5mins before B&Q shuts..... don't ask, just take my word for it.. :(
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