At your level the best equipment would be
Helmet: Terra helmet (Imbued with poweful mana leech)
Armor: Ornate chesplate (Imbued with powerful vampirism) You can also add another imbuement with certain resistance, depending on where you hunt.
Legs: Fabulous legs (Gives you 1% less physical resistance, but +2 on axe)
Boots: You good with depth calcei until you can use the cobra boots.
Axe: You should replace the axe of destruction with the cobra axe, for the +2 on axe skill, also your weapons should always be imbued with powerful strike and powerful mana leech.
Chopper is good but needs to be imbued too, also powerful strike and mana leech
Shields: You're quite ok with the shields, no need to imbue them with shield+
The imbuements you should always use, despite everything else, as a knight are:
Helmet: Powerful mana leech
Armor: Powerful vampirism
Weapons: Powerful strike+Powerful mana leech
Everything else is optional
Cheers!