Hi, Well Im not a PRO Biochem but I hope this helps,
Basically you need High Int, Cards like FBH, TG, Incant, and etc. doesnt really increase the damage of AB it really depends on your INT, so your stats will probably be
Str - Enough to carry more YGGs [although you already got a cart and hi weight capacity, sometimes it is still not enough]
Agi - 195 ASPD
Dex - No Cast or 150
Int - 295~300
Luk - 1
Vit - The rest is here
Headgear: would probably be 3 Kiels [ for spamming AB]
Armor: Tao+Gr[Anti Asura, Martyr, Final Strike, CT] , Tao+Tao, [so you would have sufficient HP, coz Biochemist dont have that much HP as you know]
Cloack: SinXCard+Skoll or SinXCard+Raydric it really depends on how you play you chemist..
Boots: FBH+Dwiz [ for spamming Cold Bolt, if u wanna have a decent damage on it, and want your enemy to switch to GTB or Maya] Dwiz+Green Ferus/GEC [use for survival]
Weapon: Always carry an edge with you, it will be usefull against Pally, and LKs..
Creator Dagger with 4 Kingrings if u want to have a high damage on cold bolt..
Creator Dagger/Any 4slotted Daggers with WS, SK, D.Warlord, VR .. To Break Armors, Divest Shield, once you've break your opponent's Armor especially when he got a GR, it will be a very big advantage for your AB..
Accesories: 2 Int Belts, 2x Rosary/Any Slotted Acc - Horong Card[For Sight]
Keep in mind you also need a Lif Hommuncoli, for the "Urgent Escape Skill" its a very usefull skill when avoiding a direct fight.
Well I hope this helps a bit, even its quite messed up, hehe im lazy atm so bare with it..
Then the rest is how you experiment on your Biochem, but still..
experience is still the best teacher ^_~ so goodluck and don't limit yourself on guidelines, there is always great things beyond safezones..