I've heard that the side terminal on an Optima is insufficient for the amp draw required by a winch. Some batteries may be better built, but Optimas can be damaged by hooking a winch up to the side terminals. FWIW i connected my winch to the top post of my battery.
odyssey, Or the diehard version, plus the cheaper agm batteries are all rated for side post winching. If that lug works for you, use it, if not, change it.
My '93 Chevy half ton had that same terminal end from factory and used side-post connections. It was always a pain to try and hook up the terminals and was easy to crossthread/strip the threads in the center bolt >:[
Use a longer (1 to 1 1/2" whatever is needed) fully threaded 3/8 bolt with a jam nut. Thread nut all the way on, install bolt through wires and tighten into battery. Then tighten jam nut to secure wires.
This is actually included in some of the warn instructions.