Yep, that’s correct. There were only 2 freq’s added. 151.4675 and 155.3550. Then the system was switched from Phase I to Phase II. Technically yes all should be entered as possible control channels but so far they’ve only really used 155.4300, 151.2800 and 155.3550.Radio Reference shows 6 frequencies for the site:
151.1525 151.220 151.280 151.4675 155.355 155.430
Does that match what you have? All must be entered for a Harris system.