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There was a later better Omark trigger just b4 Sportco disappeared. Cannot remember if it had locking nuts. Your trigger may be a Rem 700 or a NZ made Kiwi. If it is a Kiwi you have a superb trigger.

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Again, as long as you cannot induce the action to go off by slamming the bolt closed I would hesitate to touch the sear engagement.
Also, you cannot adjust the pressure screw too far off...

Be careful dry firing an Omark too many times. There is a shoulder on the firing pin assembly that can just touch the bolt head cross pin if no cartidge is in the chamber. Excessive dry firing can...

I will dig out my old Omark trigger later and identify the various adjustment screws for you. If changing any settings as well as wacking the butt also slam closed the bolt as "brisk" as you can...