I also use Hagerty, and I am paying about the same ($180). I have been an insurance adjuster for 16 years, and my best advice is: find a policy that will pay you a specific amount if there is a total loss claim. Many policies sound like they would do this, they sound similar, with names like stated value, agreed value, etc. What most policies do is agree on a value of the car at the time the policy is written, but the policy states that the determination of the actual amount of the loss will be done at the time of the claim. This can really be a let down, if the car is stolen, and the company tries to give you the "average" amount for that make, model, year...
Documentation is key. Make sure you keep a file on the car, repairs, restoration, photos, etc.
Many of the classic car insurance carriers have restrictions on days of the week you can drive, number of miles, etc. Hagerty does make sure that you have a primary vehicle, and they do want to know the amount and sort of mileage. Otherwise, they are very open.
John