Interesting bit about the float. The intake valve is heavier by design and should float first anyway, shouldn't it?
I can hear it now. "Titanium valves are junk. I got a good deal on some oversized titanium intake valves and when I tried to see how much higher I could rev it the engine blew up."
Usually what I will do is check spring pressures at installed height. The springs with the heaviest pressures I install on the exhaust side.
But to answer your question, yes, the heavier intake valve should float first, assuming the intake and exhaust valve springs are the same and the ramp rates on the cam lobes are the same.