Flop is a call.

Donk bets are fairly polar-- usually villain is asking "where are you at" with a marginal hand or Air. A small % of the time they are the nuts/sets but this is mostly in multiway pots that have some kind of draw on the board

I see no reason to consider raising flop for balance at this stake. Raise donk bets with your weak hands or air on a board this dry, flat a premium