No Bubble Left Behind strategy. What do you think?

So I unlocked W5 and had most almost all my characters parked in divinity. I was thinking of the most efficient approach for NBLB and this is where I ended up.

I start by dividing bubbles into 3 sections

  1. Sampling bubbles. I use ie autoreview to identify them. These gets priority in unlocking, printing, and upgrading according to each tier.
  2. Hard bubbles before #15. Those using salts, smithing, souls and critters. Those get upgraded to NBLB threshold.
  3. Hard bubbles after #15. Those using spices, bits and treasures. I upgrade those using Bargain Tags
  4. Rest of the bubbles get upgraded by 10 levels initially then by increments of 5. This prevents them from getting hit by NBLB.