I hate asymmetric bowling balls. I have never had a single one that reacted well for me, but I am rolling the ball much better these days, and decided it was time to once again try to put an asymmetric piece in my bag to get a different look than what I have now. (I'm a lefty by the way, can you tell fomr the name?)...
I recently threw a friend's highly touted new asymmetric release (he's right handed). I will not name the ball, because this question has nothing to do with the ball itself, seriously. Every asymmetric I have ever thrown does exactly the same thing: it lopes down the lane, makes a labored turn, and refuses to drive through the pins. I have also been told that asymmetric balls are picky, and must be drilled correctly. That was in the same conversation where I was guaranteed that using an asymmetric right handed ball would yield a valid assessment, although not perfect.
My PAP is 5x1.5 up. This ball was drilled right handed, ping over ring and MB 1 inch to the right of the thumb.
The ball, predictably, puked and puked badly. It looked EXACTLY like every asym I've ever thrown. The question I need ask is this: either throwing a right-handed asymmetric ball for a left-hander is totally ridiculous and the test is completely invalid, even though it reacted just like every other asymmetric I have ever thrown, or it is true that I should have been able to get a decent read on the ball, which puts us back into the I don't like asymmetric category.
I realize this question is a bit circuitous and I hope it makes appropriate sense, but can I trust this test or not?
Feedback appreciated as always.

Correct. I'm quite comfortable concluding it was an invalid test. Now, if I take into consideration that the MB position should reduce backend, then it gets intriguing. But that's a story for another day.

Steven, I'm thinking maybe you missed the first part, or perhaps I am misunderstanding. Apologies if that's the case. The drill may be standard for righties, and there may be a lefty equivalent, but when a lefty throws the right hand drill, is that a valid test? I think not, looking for feedback on that question...

Yea, I guess I didn't make myself clear.
 
I was essentially asking if you ever had the left handed equivalent to the drill on your friend's ball on any of the asymmetrical balls you previously owned. That pattern is pretty vanilla, and most styles should at least be able to throw it decent.
 
To your original question, the test is invalid. Being a right handed ball, for you the MB is in the weak position, and you have a long pin to PAP. Unless you throw 400-500 RPM's, you're going to see a puke reaction.

Asyms are not too much of an anomaly. They are bigger cored, shorter hook zoned, mostly fast response balls. Very few are symmetric like in nature where they can corner and cover boards. They're to be used when you chase in or you need the ball to respond faster. It sounds to me like you don't have a lot of volume, so an Asym with a much shorter hook zone will start to hook in the heads and then roll out by the time it reaches the exit point of the pattern.

As a lefty myself, I have the same issue with Asyms as there just isn't enough volume to use them. I have to wait for mild Asyms(i.e. DV8 Vandal[Very good ball btw]) or weaker shells like the Code Black (another very good ball). Other than that, drilling them is key. I use either Big VAL angles(pin down or in rf) or short pin PAP(3" or less) and drill the MB in the thumb to lengthen the hook zone so the ball reads more like a Symmetrical. I drill most of my Asyms pin down but there are a few balls that have rolled really well with the MB in thumb.

The most successful is a Radical Black Reax (85x3 3/4x45, MB in thumb, pin above the rf) that rolled phenomenally but sadly cracked. I haven't wanted to really drill another asym yet but when I do, that layout will go into it.