I am using the kipro mini. I am trying to set up the pp for Doug Jensen's VortexA. When I pull up gamma in the pp setup I only get one choice, STD5 R709. I do not have Slog.
In SLOG mode gamma curves via PP are not available.
Otherwise, you are in right place: ie. Select Picture Profile button, edit a profile, then scroll down to GAMMA, in there you will see various gamma options, ie. STD1 DVW / STD2 ×4.5 / STD3 ×3.5 / STD4 240M / STD5 R709 / STD6 ×5.0 / CINE1 / CINE2 / CINE3 / CINE4
I also put a handy PDF together with screen shots of the various gamma curves for reference: http://www.starcentral.ca/Sony PMW.pdf - but sounds like you are working with SLOG.
You must have another option setup in your pp not allowing other gamma modes. System reset your camera if you don't mind losing your settings then try.