Okay, just completed Phase 1 of my latest experiment, and I can confirm that:
1) a 306A cart plus a 306A atomizer fit perfectly well on a blu battery;
2) fully assembled, the resulting cig fits fine in the right slot of the blu pack;
3) the 306 cart + atty fits in the cart holders in the pack; and
4) a 306 cart capped with the rubber cap does NOT fit well into the cart holders in the pack, until you slice off a bit of the cap with an exacto knife (but then it fits perfectly).
I've only just quickly done a simple side-by-side test: blu cart + blu atty on a fresh battery vs. 306A cart + 306A battery on the same battery, alternating back and forth. So far, the difference in vapor production seems minimal, with the blu equipment coming out slightly on top. It may be my imagination, but I think the flavor comes
through a little better with the 306A equipment, but I'll need more time to decide.
Using Johnson Creek's Reduced-PG Summer Peach (zero-nic) in both carts, as well as the PTB
mod.