If you followed the wiring diagram for the Sundance Optima, you ran 2 "hot" conductors and a ground conductor to that 60 amp panel. Sundance uses a transformer to power things like the lights, radio, etc, that run on less than 240 volts, so there is no need to run a neutral leg to the spa.
Hot Springs may (or may not) require a neutral.
You may have to totally re-wire this. Especially if HS requires a neutral.
That's why you have to decide on a spa before you run your wiring. Most (but not all) require a standard 4 wire 50 amp configuration. Many Sundace spas use the 3 wire configuration, Cal Spas had or had specific requirements for some of their spas too.