Maybe I am mixed up in between the B205 and 212 but the fact of opening the Interconnect valve won't do much, the fuel comes in from the 3 rear fuel tanks and goes in the 2 forward tanks (lower)until they are full and then fills up the rear tanks. As long as you have fuel in the 3 rear tanks, they will feed the 2 front tanks interconnect or not. Again unless i have got my systems mixed up.
Also doesn't make no difference if you lift the right side, by the time the fuel gets close to the opening, fuel will be coming out from the left fuel tank vent to start and you can only go as fast as the air comes out of the aux tanks or any tanks when it gets there. If it's way too slow, check your vents.
I have been known to be wrong once in a while though.
JD