So here’s a screenshot of the titan harpoon info for a 5* titan:

From this, I get that:

Reaching Tier 1 (7 hits) makes the titan drop parts (the # of parts is based on the loot tier you get for the titan)

and

Reaching Tier 2 (18 hits) makes the titan drop 2 additional parts, along with the parts you get for the loot tier.

What I’m not clear on, is the loot for Tier 3. Does “5 extra Titan Parts” there mean the X parts for Tier 1, plus the 2 parts for Tier 2, *plus* the 5 parts for Tier 3 (i.e.: 7 extra parts), or does it mean 5 extra parts **total** (5 parts plus the X for the Tier 1, so really just 3 more parts than if you only hit Tier 2)?

If reaching Tier 3 only gives you 3 more parts than reaching Tier 2, it doesn’t seem to be a good return on investment, since the 2-to-3 jump requires a disproportionately higher number of harpoons. Right?