I know this is an old post, but I recently picked up a couple of 80ti/50s. At first they were also a challenge. One had pretty flat bitting, which was disappointing, but the other is fairly wild.
Both my locks it seems like pin 1 is the standard pin, so usually just inserting a hook and rocking up on pin 1 with the shaft lifts the other pins enough and drops both locks into false set. From there, my previous problem identifying the correct spool was that I would tend to let up on the tension wrench a bit as I tested each pin, combined with the decent spring force meant I would sometimes think a pin was the incorrect one.
Now I crank down the tension pretty good, feel for which one gives the most feedback before deciding which to set first. Even with having to set all 6 pins, I've opened these now in 30s. Though sometimes other pins do drop and it can take me up to about 3-4m to crack it open. At least it feels good when it's open even if it took a while.
My bigger problems are now spools on cores without spring action (have one challenge lock pinned up) as I have to twist with the pick the opposite direction and put quite a lot of force, even then half the time the pin over sets.
Makes the Abus look easy by comparison.
Also on picks, for me, on the flat bitted lock, the standard hook works fine (mine is a modified Southord), but on the one shown above, a half-diamond works much better allowing it to both set deeper pins, and also rock out of the way of shallow already set pins. I have an offset ball from a Dangerfield set, but they are much thinner in height than the half-diamond so seem to flex much more when trying to set these tough spools.