that's why you use horrify for it's rune effect, not it's fear effect.
however, if you're in a dire situation where you are about to die, you have the fear effect on standby just in case. it's a win win.
only way to do this without fearing mobs as well is to pre-cast while running in, and with an 8 second duration it isnt great unless your ehp is terrible. I've tried to make horrify work since Im attracted to the armor buff but the fear is just far too counter-productive for my taste.
paranoia is gonig to be your best spellto use for a max dps setup (slam dance stacked with paranoia, on top of the int gains from soul harvest makes for some insane burst damage).
I too have been looking for spells that fit right for bats build and like most people have found that a couple of our spell slots are situational / swappable.
-locusts are good for farming, to round up the mobs
-paranoia is great for burst dps, also useful for survival (too many mobs hitting you at once and spirit walk on cooldown, casting paranoia can often save the day)
-bears are good vs RD and while kiting
-sacrifice with pride or the last rune (forget name, but it adds 5% dmg per dog) in combo with circle of life passive is fun, but unfortunately sacrifice interrupts channeling.
-also i find GF passive doesnt really do much unless ive got a zero dogs in my group. Never seems to be enough globes to keep 5 stacks up. Spirit Vessel is great, increases soul harvest spam (so a dps boost slightly) and SW spam (big mana regen boost as well as survival).
ive been playing around with other spells, many of which work well with CoB build (so try some others out yourself maybe) but have yet to find a spell that is just so good that it earns a permanent slot on my bar haha.