、。
If you make too much we won't get through it, so go easy.
Literal
A-lot make [even-if-ても] handle-[completely-negative-きれない] [because-から], modestly [emph-ね].
~きれない is the potential-negative of the auxiliary ~きる 'fully / completely,' forming 'cannot fully X / can't handle X completely.' 捌く (さばく) is the verb for 'handling / processing / dealing with' food or orders, extending from its literal 'to slaughter / cut up.' 控えめに 'modestly / restrainedly / on the conservative side' uses the degree suffix ~め combined with adverbial に.