Determine insurance coverage amount and recommendation for agent

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Yesterday I received an email from NREIG that they have decided to increase my monthly premium by 20% per month. I own 4 rental properties in the Tampa bay area with a coverage amount of ±$70,000 each. I also have name storm insurance on each and every property. All of my properties do not have a mortgage on them yet.

I just feel like 20% increase after a year is a bad trend, especially when I have not had any claims. I would love to get recommendations for agents.

Additionally, I've been trying to understand how much coverage should I put on each property. Most of the times I put what I paid for the property or what I paid + renovations. I feel like thats also costing me on the monthly premium. How do you guys calculate and decide the amount of coverage ?

Thanks!