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This, 100% this.
We had one fitted 2 years ago and has given us reliable pressure hot water and heating ever since.
Ours sounded like yours with a mixture of shitty boiler, pumps and there was even a mystery mains heated cylinder previously there for the loft bathroom water tap.
Have never looked back after having an unvented system fitted.
user67526
Fuck the pumps off and fit unvented if you have got decent cold mains pressure.