Didn't run your subsidy, did you?
Just using a Panama City zip code for the hell of it and without knowing what your zip and ages of you, your wife and children, used 50 for you and your wife and put you kids in their teens this is the estimated subsidy you'd receive for $75,000.
You are likely eligible for financial help
Based on the information you provided, your income is equal to 255% of the poverty level. This means you are likely eligible for financial help through the Health Insurance Marketplace. An estimate of your cost for coverage and amount of financial help in 2019 are provided below. To find out your actual amount of financial help and to get coverage, you must go to Healthcare.gov or your state’s Health Insurance Marketplace.
Estimated financial help:
$1,576 per month ($18,907 per year)
as a premium tax credit. This covers 75% of the monthly costs.
Your cost for a silver plan:
$532 per month ($6,383 per year)
in premiums (which equals 8.51% of your household income).
The most you have to pay for a silver plan:
8.51% of income for the second-lowest cost silver plan
Without financial help, your silver plan would cost:
$2,107 per month ($25,289 per year)
Health Insurance Marketplace Calculator