Another insurance question

We had National Interstate for 4 years but after a rate increase (for no reason or claims) both of the last two years, I did a little checking and found a much better rate with Blue Sky. The only difference is Blue Sky only allows a max of $15k for contents coverage, where National Interstate we had $20k and could have as high as we wanted. I checked Progressive and found the best price at Blue Sky.

In my research, I did find that National Interstate had an incorrect rating basis (value of coach) listed and when corrected it reduced their premium but still not as much as Blue Sky