I do looping too, but usually start in garden and will loop garden until I get one, then switch toons and do NOT use a Three on the one I just killed. By the time I get to third toon I only pop on one boss. Once I finish all three of those I start the planetary cycle you have and again drop bosses from cycle with each time I switch characters. I recently did this method Sunday and Monday nights (10/16 and 10/17) for maybe a collective of 4-5 hours total, including zoning, switching, re-gearing and general lazzyness (not being in a hurry) and skipped planetary boss rotation for the most part. I started with 147 3oC in Inventory and one on each character for 150 total. 4 3oC in 5 rounds of Trials, (first paid off rest didn't) 4 used 146 3oC left 1 exotic (1/4 ) 48 3oC across 8 characters (3, 2, 3) in three different time spans about 12 hours apart from each other (Last one took 12 3oC to get as I was using on every boss instead of just the one remaining) 48 used 98 3oC left 8 exotics (1/6) 1 3oC eye of Gatelord first paid off, too tired to continue... 1 used 97 3oC left 1 exotic (1/1) In total I used 53 3oC, and got 10 Exotics for about 1-5. This weekend I'll try the planetary w/ taking killed bosses out again and see how that stack up against a mostly "garden" play. In my own testing in the past even outside of this, Boss kills are account based and time based to each INDIVIDUAL BOSS, but the more you kill the same boss over and over the less of a chance of it paying out regardless of the character used...especially if already killed and collected with all three. I've also tested the Tomb before and spammed 3oC before watching bosses and not repopping on the same ones and lost TONS of coins (about 40-50 for 2 exotics... I was physically sick), and paid more attention (even on same character w/o switching) and only used on ones I hadn't gotten to drop one before and was about 1 in 7 to 1 in 8 which to me still isn't as good as other places and methods. Every 3oC has a chance, but we still don't know the exacts of the base % chances for drops, or cooldown / % reduction after killing a boss and trying to repeat. I've seen people in my party get back to back to back in the same play in the garden and I've even gotten double drops before as well and I've had times where I went 20+ w/o a single one. At the end of the day I'm sure there are some built in factors we don't know but it's still RNG.