no data there, just lore stories, plus at jameson you can position your ship/SRV to scan all 4 without moving (just rotating) then do a menu relog and go again
Not true - the data point (the red periscope thing) gives encoded mats plus some low value intel packages for imps and alliance - you can also target the circling ships (use turret mode) to glean the occasional encoded mat. Always worth scanning the data beacon each circuit of Dav's - after all you are there anyway, why not?
For MEF farming, I still like the base-runs - scanning the 3 data points at a M2M site. I really detest the thought of having to trade 6 AECs for 1 MEF so the srv circuits are my preference.
BTW - The use of task-kill exploit to farm HGEs feels like a real deal-breaker for me, seems so much more unpalatable than the relogging for other mat farming. So I tend to just hop from Imp system to Imp system and filling with ImpShielding that way. Seems more enjoyable to me.