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I don't have experience with a FTL although I did suffer through a IRS Offer in Compromise for 2+ years - one where they did NOT file a lien although they could have. I don't believe that the IRS will willfully remove a lien until after the full amount is repaid.
I'm sure anything is possible and I'm sure there are success stories, but my nightmare with the IRS showed nothing but incompetence such as it was a joint OIC because the business was jointly owned, once we satisfied the payments we had to nag for a release and THEN they went after us individuality. First they said oh sorry and released my wife, then they came after ME for over $200k. Round and round (we kept all papers and conversations), KC doesn't talk to Jacksonville, Jacksonville doesn't talk to Phila - and it was 2-3 hours on hold before they'd pick up the phone, just to transfer us to someone else for another 2 hours wait.... this went on for weeks AFTER we had paid in full the complete OIC.
Good luck, who knows maybe it''ll be easy