ok if I did it right that would make the temp 79-80 F
since he hides when people walk by that telssme he is very skittish and possibly stresses him out a bit , I would try to add more hiding places, or if there is already enough cover might want to try turning off the light for longer periods of time and slowly adjust it back .
what kind of feeders are you trying to feed it? with other types of predatory fish I have found that they seem to strike smaller feeders such as guppies, or if you can get a hold of some red wiggler worms they are smaller then nightcrawlers and when they hit the water they tend to roll and twist and have alot of action that will trigger the fish to strike out of instinct, I would even give crickets a try as well.
before I forget its important that you QT your feeder fish for a few weeks just so you know that your feeders are healthy , would hate for anything bad to happen to your SH because it ate sick feeders.
hope this helps you out, looking forward to seeing the pics
O I forgot to ask what size the SH is
if possible list the sizes of the other fish in the tank as well