Oh, I see. And the Mentalist list doesn't have that issue because it only has Mind Store, not Long Mind Store.
Probably the easiest solution would be to change Long Mind Store and Long Mind Typing to require the target's mind has been detected by any seer spell. Or, allow the caster to use Presence from their sensory point when using Scrying, Long Sense, etc. You could limit it by requiring a spell mastery maneuver to do so.