Monitors are different so your 13-14 may not be the exact same as ours. Try to look at just not what the monitor says but to what the average seems to be between yours and other bowlers. Here in ether of the houses I bowl at 13-14 would be average to slightly below average especially among the top tier guys. You can still be speed dominate and if your lower revs those balls would be useable for you on a medium or heavy medium house shot but I wouldn't be surprised if you needed to switch ball around the middle to end of the second game.
The core in the Warriors is very asymmetrical (.20) and the cover on the Grudge is extremely strong. I think both of these balls are really good and have a place in a multiple ball bag but I wouldn't consider either as my bench mark ball that I was going to use all the time but my game is very different from yours. When my wife who's game is probably closer to yours than mine really started bowling seriously she did use the original Nirvana as her benchmark as her game and release have improved through working with her coach she finds a lot more use from her Mastermind Braniac than she does the Nirvana but the Nirvana still gets a lot of use. Hope some of this has helped.
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