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@Airhead
Sounds like the boiler could be at fault, reduced flow rate. You need to test the flow rate a little more scientifically. From your description you have no problem with cold pressure which is what feeds the boiler so asking the boiler to heat the water less should increase the flow rate. Possibly furring in the boiler matrix. Boiler internals can be serviced but you should find out the spec for the optimum flow rate and compare it with reality.