Greenfuel's system doesn't have this issue... the gasoline injectors pulse once every few minutes to stay clear.
Yes. I noticed this in Greenfuel's SGI. Every 15 minutes or so, the system switches to gasoline for 5 seconds or so. Minsan kasi pag nata-timing na nagloloko LPG ko (i.e. ayaw mag-accelerate no matter how I floor the gas pedal) tapos nag-switch sa gasoline, biglang harurot naman ako...5 seconds nga lang kasi pag balik sa LPG, kapos ulit power.

This is simple enough to correct with a wideband O2 sensor and some programming time... which Speedlab can provide. Otherwise, you can "clamp" the O2 sensor with a resistor so it won't be able to detect the difference. Still trying to find a source for the clamps (for another project... ), but you can ask Speedlab or other tuning shops about it.
Oo nga. I think I really need to pay Speedlab a visit...