You're not going to find any real testing, because none has been done. Which is why no one can link you to it. The best you can do, is just eyeball it. Feel you're getting 200-300 damage Pclaws too often? add some accuracy.
To add some more personal anecdotes, depending on what I'm fighting, Garuda melees 20-40 damage a hit. Perp is generally 2 a tick, but with a few twitches, it's fairly easy to get 1 or 0. Even though it's not quite right, if you assume 2mp per attack and we take the lower end (20 damage a hit), then you've got a 10 damage to 1mp spent ratio. That's fairly mp efficient already. And it only goes up as your avatar deals more melee damage, and your perp cost stays constant. Doing 40 damage per 2mp spent is, ratio-wise, equivalent to a BLM spending 171 mp to do a 3420 Thunder IV. And once you get a free avatar out(with no outside forms of refresh), the mp efficiency is unmatched.
Someone earlier mentioned getting an extra 200 damage per BP from a piece of gear. If you assume 45 seconds between BPs, an avatar attack speed of every 3 seconds(which I think is slow), and 20 damage a hit... then you get an extra 300 damage between BPs. Are you getting an extra 300 damage from +15 attack? I haven't seen that.
And that's ignoring the additional damage you'll get from a magic BP, from the TP you're gaining. Double Attacks help this as well. The haste from the hat coming up in the moogle mini-xpac is gonna big a big temptation as well.
Of course, if you're zerging something that's gonna be dead in 1-2 mins, then all this doesn't matter much. But SMNs are rarely taken to quick zergs anyway, as they can't output the burst damage that a SAM or DRK can. And I tend to solo things that have much more HP, and take 8+ BPs to kill, so this setup works well for me. I haven't used carby to solo anything in forever; safe, but too slow.
Your situation and mileage will vary.
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