If you can test everything, use which set of gears suits you better.
If you ask me what i usually see: i usually see ppl using one of the Twins Naght swords[AS3] (mostly the RTE for the damage, and sometimes the BTE for the element)+shield, or Erde+shield, or Byeollungum+Shield(mvp only?). Sometimes i see ppl using HurricaneFury too.
If you ask me what i use: I leveled my gene with a +9HurricaneFury[AK]EA6, and the only leech gear i have ever used was the Rideword hat, but i don't rely on it for my hp, it was mostly for the sp, i usually switch to pumpkin hat, recover my hp, and switch back to rideword. Currently i have a +9HurricaneFury[AS]EA8.
Then you will say, "but with HurricaneFury you can't use shield". So, for leveling up a gene i recommend to have a Sera with PK, it may reduce the damage of most monsters to 1, ofc u may have a garment with raydric card to help, also the higher lv ur sera the better. You can use a +9HurricaneFuryEA8 with either card you want(AS,AK,HF), it may still do a great damage on common monsters. In my opinion, it is one of the strongest weapons for a Gene (you just gotta get a higher upgrade, EA12 enchant and a good card to beat mjolnir->from what i've heard).
If you want to every normal monster you ever fight (before lv150) have its damage reduced to 1 with PK you may use shield (i'm saying this 'cuz i had to use shield to fight mobs of Dolomedes, even with PK). Now, if you ask me the best weapon to be used with a shield, i don't really know.
When i was fighting Dolomedes, my PK reduced like 900 damage i think, and i had a +8RTE[AS3] and a +9HurricaneFury[AK]EA6, a FAW EA10[with that card that increases ranged every 10 dex], and a +9[Raydric]Nidhogur Garb. if i use HurricaneFury+Nidhogur, a single dolomedes would hit 1~100, and a mob of them would hit nearer the 100's. I would hit around 15k on them tou. For HurricaneFury+FAW, i would hit around 20k on them, they would hit harder on me, i don't remember how much exactly. If i use RTE+InsectShield+Nid, mobs of dolomedes would constantly hit 1, but i would hit 10k~12k on them. If i use RTE+Shield+Faw, i would hit around 15k on them, a single one i think would hit 1, but a mob could achieve 50~100 damage per atk idk.
I think the best would be a +9HurricaneFury[AS for leveling/AKfor MvP](EA8+)+[Raydric]FAW EA10, which are my current gears. With a lv150 sera, you would get 1k reduction, and you would probably be good to level up on most places till 150.
For MvP, HurricaneFury[AK] if u have tanker, if you don't, Erde[AK2]+shield[racial or alice] or Byeollungum+shield[racial or alice] are what i see most (ofc upgraded and enchanted).
Idk if you should consider much what i'm saying 'cuz i'm kinda "noob" still. But if you wanna know, i have a guild mate that uses a +15HurricaneFury[AK]EA12, he's lv175, i think he uses runaway magic temporal dex boots, FAWEA10, etc. when the runaway magic actives he can hit 250k with CC on beelzebub.
Well, as long as you have PK, i think you can level up with almost anything, GL on your research