Proper LPG maps are done while test driving, not stationary (and not two points, idle and some other RPM) - some cars will drive OK with that, some won't (gambling - and the risk is for example engine premature wear, burnt valves & seats).
Ideally with extra lambda sensor in the exhaust (just like real "tuners" do after remap, dyno tests etc.). Not obligatory, but it's a "nice touch".
What's the reason you do those "adjustments" in the first place? Any problems? Failed "MOT" or what? Lack of power, high fuel consumption?
Is your car 100% OK mechanically? Engine, turbo, intake & exhaust with no leaks and so on? LPG equipment (pressure regulator, filters, injectors) OK?