I very recently replaced the gas hob that was in this house when we purchased it. At the same time I removed some of the old gas piping (had very small leaks behind the oven and was way out of spec). The old gas pipe didn't have an isolation valve and had a very small leak. In the new system I fitted an isolation valve, replaced the hose connection with a soldered joint and removed about 5 straight through connectors and elbows to replace with a nice clean straight run.
The problem now is that when the combi boiler fires for water or heating the hob flames get smaller. On individual rings it's not really noticeable, but on the large centre ring it's quite significant.
I've checked the isolation valves on the boiler and hob and they're both open full, I've also checked the valve on the gas meter and that too is fully open. There aren't any other gas appliances in this house.
Have I done something wrong? and what can I do to rectify this? Thanks as ever for any and all advice.