You can use the "one step on two tracks" bonus in the event that you had not found the virologist and immunologist. If you only have one active track, then advance two spaces on that one track.
Yep. The "or advance two tracks one space each" option is there for groups that haven't been keeping up with their Searches, either because they haven't been prioritizing Searches or they've just had bad luck with them. Those Searches would still be available to them in August, and the "two tracks one space each" option gives them a little help catching up.
In your case, your group has been keeping current, so go ahead and do the double-move.