That's awesome growth. Congratulations!
Some HSB will be a nice addition. I have less than (20) in my 6-7 acre pond, however, I don't feed regularly (maybe just some hand feeding a few times a month in the summer). The reason I put such a small number of HSB in my pond was because I just wanted the occasional sighting or catch.
But it is cool to watch an ongoing, moving, multiple fish boil in the water from any distance when the HSB are crushing on small bait fish.