Sorry for the delay, I was gone for a while...
You already got answered for blade + ww
Although, note that even if it helps a ghost with a diversified arsenal, it's very far from the same potential dmg a pure blade sin can get.
A blade sin needs +trap skills, high DS%, as much off weapon ed% as possible, more ar, and doesn't really benefit form +max dmg (way better with 36/20 than 3/20/20 for exemple)
So dropping phoenix for dual claw is already a massive loss of dmg for your blade skills, and itemization/inventory for ghost will also keep lowering the effectiveness of your blade skills by about only half of what they could be.
That's perfectly fine if you want to go that route. Just very different build and playstyle.
To answer you other unanswered question...
Blade sentinel has a delay of 25 frames, and a different action frame than other traps. (faster & less breakpoints)
EIAS / action frame / total frames
-10 / 9 / 34
0 / 8 /33
15 / 7 / 32
34 / 6 / 31
61 / 5 / 30
With a GT/RT -30WSM, you have ias tables of :
0ias 7AF
5ias 6AF
42ias 5AF
I'll speak on the subject like if we were still talking about pure blade sin, but it would need to be adapted for a ghost sin. And the way you talked about amp and merc makes me feel like you're looking for info more related to pvm than to pvp, so I'll try to stick with that in mind...
As you can understand, the minimal bonus base dmg from slower WSM claws is so negligible for a blade sin that using a faster base is really the better option.
Still possible to reach 5AF with a slower base, for exemple a pvm build would normally use HL + Loh, for 40ias, then using a -20WSM claw you'd need it to have 30ias, or 2x 15ias jewel in helm.
Or with a -10WSM claw, you'd need 90ias total, so HL + Loh + 40ias on claw + 15ias in helm.
With a GT/RT, still using HL + Loh, you would be looking for a rare claw with only 10+ ias to reach that 42ias bp, or even simply use a 15ias jewel in helm if the claw doesn't come with ias.
You can't perform any other action during the action frame, so having an AF of 5 is nice, while at AF 9 you feel locked in place much longer.
Not critical for pvm, but obviously faster = better
I wouldn't dare call it a pvp build if you don't reach 5AF, as a longer time frame leaves you very vulnerable to telestomps.
Something else, you were asking about plague!
It's a good starter until you get a gfg rare.
But I believe you saw that post about rerolling a RT with 3 chip/norm/flawless gems?
1.13% chance each time you reroll to get fools, 50/50 for 2os, so 0.565% chance to get a simple magic RT with fools and 2os.
And you know what? Put 2x Lo in it and it already outperform a perf plague RT.
So that magic RT that can be SSF'd in a day is, imo, the best starter option. Only cost 2x Lo.
The reason is, a bladesin mostly struggles with her hit chance.
Even while using an inv full of trap skillers and 10x 36ar/20life, a perf raven, if I switch between plague and a plain fools claw with 40% DS, I lose on average 4-6% hit chance, and 3% DS (if lvl 99, or more if not max lvl).
Both hit chance and crit chance are direct multipliers of your total effective dps on a blade sin. The 2skills and ed% from plague ends up being a ~5% dps loss on my current pvm setup if I swap between both these claws.
But yeah... if you're looking for real high end claw...
you need those 3 affixes : 2sin / fools / 2os
There's no room for any other prefix, those 3 win by a very large margin.
Bonus for staffmods (possible to get claw mastery + blade sentinel + blade fury on a claw if you imbue it at clvl 8, or if you reroll with pskulls on a clvl 1)
And good suffixes would be : ias, amp, -req%, leech, chant charges
+min/max dmg is practically irrelevant, so is eth + self-rep (and it's definitely not worth to try to imbue a eth claw for a bladesin, as it will always be bad without self-rep, unlike a ww claw that you could zod, you just really need that Lo rune in there)