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Reading your post again... Trvs restrict flow when the room approaches the set temperature, they do not control the temperature of the radiator. Changing to a combi boiler means more than likely the flow to your radiators now takes a different route, so they will not get hot in the order you...

Just a thought but when you say you've put them both on 2 are you sure? I e so 2 lines up with the indicator, not just 2 facing forwards or whatever.