How much of the $400k value is land value? Don't need to insure that. I have had interesting conversations with agents that feel that sales price plus some cushion should be used. Without knowing that, to me, it is hard to say whether you have enough coverage. Your lender hasn't complained so perhaps enough.
The 208k in personal prop loss sounds high but, in my experience, lowering it doesn't change your premium too much.
Do check on the deductible. Yours is incredibly low. It has the biggest single impact. The norm is often 1% or 2% of coverage. Yours could be $3-4k or higher. In my view, if changing it to that level does not lower your costs much, then stick with the 600. But, really, 600 is the sort of deductible you have on a car.....much higher likelihood of using that.
I recently switched to Allstate.
Your rate seems decent, but I've never lived in that area. I paid 1300 on a 900k home in Illinois, but now pay 2300 on a 400k home in Texas. Natural disaster and crime seem to be the largest factors.