I see no advantage bowling the Masters. There are 3 main reasons why:
1) Oil Pattern is totally different - while the USBC pattern, whatever it will be, is tougher then a THS, it is no where near the Masters' pattern.
2)Breakdown will be different - especially if you have a team working together at Nationals to break down the pattern.
3)Atmosphere is totally different - While some may feel some pressure bowling at Nationals, it is usually more for fun. While the Masters is for $60,000, and if you are a PBA member, a 2 year exemption. That will make a difference as well.
You may have a tiny advantage of knowing the approaches and their tackiness/sliding but it is not enough to give any kind of advantage in scoring at Nationals.
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Jorge300