I originally mentioned in my answer only the $1k safe harbor, but, as you mentioned in your question, there is also a safe harbor of 100% of last year's tax liability. Still, with a substantial increase in taxable income of $22k you might want to pay as much of your estimated tax liability by 1/15/2019 as you practically can so that you don't risk coming up short on funds to pay the remaining tax liability by April 15. Also, don't forget about state taxes.
