There's a point where having more atk% gears will be more beneficial than having crit damage gears. I've learned that on my GX. I benefited more from cards like the Buffalo Card for accessories rather than having 2 ominous heaters. I also got higher damage with ATK VWE vs Crit VWE. And STR Mant all the way for me. As for the weapon, C.Wandies are definitely better for me. My RK already has around 200-230% crit damage, I benefit more from having +60% size damage bonus than having more crit damage.
Living Dead on armor for me because I often use Crush Strike to start.
As for costume enchants. I use Crit Stone Upper, Mid, and Lower, then Double Attack on Garment. You get the same crit damage bonus, but you also get +21% (roughly) more dps on your auto attacks because of level 3 Double Attack.
So my set up currently is like:
+12 Old Rune Circlet (lvl7 Expectation, Purple Ferus)
Victorious Wing Ears (ATK +10, ATK +3%, Purple Ferus)
Spiked Scarf
+12 STR Soutane (Str Blessing, Crit +10, Living Dead Card)
+12 Claw Sword (ATK +10%, Boss +17%, 2x C. Wandy)
+12 Temp Str Mant (Critical Damage +9%, Petal Card)
+9 Luk Boots (EA/BP, Geffen Bully Card) - I don't have FS boots, sad :c
Illusion Booster R (Fatal4, Delay4, Drain Life, Revolver Buffalo Bandit Card)
Strong Insig (Strong, Fatal3, Ominous Heater Card)
Costume Upper, Mid, Low (Crit Stones)
Costume Garment (Double Attack)
Penetration Shadow Shield + Shoes and Racial Shadow Armor - Unless you have a way of adding more Def bypass, the missing 40% is gonna be noticeable with monsters/bosses with 350-600 Def.
Ignition Shadow Set - I find the extra IB damage more beneficial for my play style. I tried removing the accessories and my IB damage went down by 300K+. That's a lot. But I do want to play around with my +10 Almighty Set tho. It is a good alternative if you have it. (Update: yea, Almighty Set is overall better for DPS. lmao)
Hasty Shadow Shoes II is better imo than All Race Shadow Shoes. If +10, but at +9, they're the same.
I tried Igni Shadow Weap + RK Shadow Shield + Hasty Shadow Shoes + Critical Hit Shadow Armor, and I wasn't really a fan of the damage, compared to just a penetration shadow set. And that's just on level 150 eggs. Thana will solve that problem, but I don't have 5b laying around lmao.
As for Runes, you can add Hagalas and Verkana Runes there. Their mats are super easy too.
With buffs, foods on, my RK has about 95k-100k HP. Hagalas gives you a shield worth 25% of your HP. That's practically an extra 25k HP.
Verkana gives you 1-4 hits free from your targets. Really useful if you can kill your targets before they can inflict damage on you.
Rhydo Rune (Crust Strike) is also useful for me. Starting off the fight with 5-15m single hit attack is awesome lol.
My farm spots are magma 2 and ogh for Hagalas, and Nif field 1 for Verkana. Rhydo mats are just NPC items.
Anyways, that's my experience with playing around with my Crit RK this past week.