OK, so I would try Pilot's suggestion first....... balancing. Failing that, maybe de-sludging, especially if the pipework is small in diameter (minibore/microbore).
De-sludging is usually the last resort. Since you're new to the house, it may be the layout of the pipework. If the right pipe sizes and layout haven't been set up properly, you may have a "dead leg" i.e. a run that is so badly positioned, that the general flow tends to bypass it.... even under pump pressure. Again, unless it's a diabolical DIY installation, balancing should overcome it.