While I agree with your points that citing a crit as a reason to hit/exp cap is silly (RNG is RNG), it is important to keep in mind that IF you can find gear that is Hit+Exp allocated, you essentially don't scale down the secondaries at all. Meaning that you can inflate your OTHER secondaries (by keeping hit/exp off of them). I don't think that's what Raxxed was saying, but it's a very valid min-max CM strat. I ran with 7.5/10.5 on my Pal and 7.5/7.5 on my DK, and made RB times easily.
Even so, I don't think OP was looking for realm/region bests, just wanting to get gold. I personally just did golds a few times and quit, as I don't find racing the clock thrilling or creative in a mechanic sense, but that's a discussion for somewhere else perhaps. Comp stacking, subject to brutal RNG with patrol locations, reliance on invis pots, and artificially challenging solely due to the clock?...meh, just not my thing. But I do still need to do them on my monk (even tho the gear is fugly )