Nobody mine in hi-sec while paying 100% attention on game, but where is big difference between 24h afk mining and mining while you do some other things (like eating, watching twitch etc). Expecting people to stare on dscan for hours while mining veldspar in hi-sec is not very clever to say the least.
If Triglavian Recons suppose to combat afk mining and not to shut down hi-sec mining completely, they need to give players more time to react, imho. Increase locking time considerably, especially when targeting small ships (venture in particular). Decrease initial dps while slowly ramping it up over time to much bigger values, to kill really tanky ships if they fail to react in say 10-20-30 minutes. Make them cruiser/battlecruiser size to better represent their danger level. Allow them to jump to mining anomalies, like rare ore deposits and ice belts (places, where actual afk mining happens most of the time). May be tie their strength/numbers to security value (if this is not a case already). Increase intervals between jumps, so there will be more time to mine in peace. Do not respawn new group immediately after they get killed.
And add them to default overview, ofc.
I like general idea, it just need to be better implemented.