Sounds like you have pretty good tap water- What type of chemical routine are you using. Bromine tends to pull down Ph over time, so if you're using it, I'd not bother trying to lower anything that little bit.
Your starting water is pretty close, I'd test again after you get done adding all your chemicals. A common thing is to overmanage your water when your spa is new.
Does your dealer offer any kind of water testing? They may know about the water in your area and if you need to worry about mineral content. If you get your water from the city they should also be able to send you a report on your water's mineral content.