Two doses per operative — one out, one back. Hank Pym's entire remaining supply. There is no second attempt, no re-run, no second chance to get it right.
Any operative who burns a return dose is stranded in the past. Any unplanned detour must fund itself from another team's margin.
You cannot change your past to change your present. Your past becomes your future; your former present becomes the past. Killing baby Thanos changes nothing here.
The stones create the flow of time. Remove one and that timeline branches — dark, unprotected, and permanent unless corrected.