The only setting that concerns beta units is that you choose to participate. The remainder involves mostly luck and timing.

I do anticipate some additional settings being implemented for the HCC GPU betas, but at this point no one can say (with any accuracy) what they might be.

Betas are assigned to all machines equally. There is no requirement for being reliable, fast, or any such measurement. Occasionally, they will release a round for a particular operating system; this would be announced if those conditions were present.

If you're willing to research the best ways to get beta results, that topic has been thoroughly addressed in the forum.

actually yes, if you have a large cache it will prevent you from getting a beta. This is because betas have a deadline of 4 days or less, so if you already have 4 days of work, you can forget about getting a beta.

edit: spelling

Not sure I agree with your reasoning here. As long as the client is asking for work, the project will send it. If the unit won't finish in the allotted time then it will trigger high priority mode.

Betas have a very high priority in the scheduler. If they're available when the client requests work, they should be first in line to be sent.

Let us not forget the need to assess the chances of a receiver to first catch the ball relative to the defense, and next the chances for a touchdown after the reception of the ball. A 4-day cache for a 4-day deadlined WU presents a tough defense coverage for any receiver cruncher. This cruncher will not likely get the ball thrown to him regardless of how much of a superstar receiver the cruncher is, or how much of a super-accurate passer the quarterback scheduler is. Instead, those receivers who are wide open will likely get the beta ball, and with that, a very likely touchdown, and with that win game after crunch after game after crunch after crunch. Because the OP's query is how to increase the chances of getting the beta ball, a low cache setting is just about right on the money ball. Any team is willing to settle for a good ball reception first, and next work for the crunch/touchdown, but only a good team knows that it has to read the defense first and then factor that in to its offense so that the receiver has the highest chance of a good ball reception.
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SekeRob, yes, I know I read your FAQ before posting the second time. However, from my experience, even if none of my WUs are in the hi priority state, I will not be able to get new betas if the schedulers thinks that I will not finish the work on time. This usually happens on my older machines. It doesn't really matter, since most ppl who are trying to get betas have tons of way around it.