Within IS Boxer, the command for Strobe is:
/jamba-follow strobeonme all

And to end Strobe:
/jamba-follow strobeoff all

In both cases, it uses the "tag" word: "all".



Opening Jamba, within Warcraft.
Under Team, there are four options.
The second option is Core: Tags.

When I click on my Paladin, the tags are:
all, justme, paladin, slave.

When I click on my DK's, the tags are:
all, death knight, justme, master.

I assume the master/slave changes, based on who the current leader is.
(I'm checking this with only one account launched).
Anyway, each of your DK's has the tag: "death knight".



You could try:
/jamba-follow strobeonme death knight

In theory, that will have Strobe activate from the window the command is given in.
IE., that is the target who will be strobe followed.
And in theory, you're telling only the DK's to strobe, not your healer.

Pretty sure that will work.