LTV needed to refi?
FHA cash-outs are not available in TX. Max LTV is 80% for a cash-out in general in TX.

What rates can I expect for an educator loan program?
The rates for your loan will vary more according to your credit score and the loan program you select than they will for a special program targeted at educators. As long as your husband's scores are at least in the low 600's, you should be able to get an FHA loan.