Nice post GD.. That's what I do with my system, even after only a couple of weeks..
I first turn on the tanks.. I do see green on the switchover. Then I go in and turn the stove fan on, then I open all 3 stove burners.. I then hold one of those long shaft manual lighters on the front burner.. It usually takes a good minute or two for it to light. Then I light the other burners and then let them all burn for another minute or so.
I shut them off and then I fire up the HW tank. It's the farthest gas appliance from the tanks. Once it lights, the fridge will light after a few sparks and all is good...
Been doing that forever and always works...
Not sure what else to suggest to the OP, since I've never experienced his issues...
Good luck!
Mitch