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on a high revving engine thats normally got bigger pistons in it the crank case pressure is much high and can even be several psi positive in the case. add to this the extra rpm means extra oil flow as the pump is pumping more oil and the oil that gets up into the heads cant flow back down the push rod tubes.
i have seen drain tubes added to the rocker chamber on some engines to try and get the oil away and back to the crank case.
I very much doubt the valve seized due to lack of oil, more likely it tagged the piston first and bent, or the guide collapsed and grabed the valve.
in 20 years of working on these engines and the engine builders i work with i have never seen any one need more oil n the heads. thats not to say your engine does not need it but IMHO it wont.
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