BUlk voltage is a screwy term, as during bulk, voltage eventually rises to absorption voltage. Technically bulk should end at absorption voltage.
IMO, 'bulk' should refer to initial amps applied to depleted battery
Trojan has been saying 14.8 absorption for a long time no?
I thought the 16.2 from 15.5 rise and 13.2 float to 13.5 was a more recent change.
I remember seeing rolls surrette user manual saying 16.2 fo EQ, and then seeing that trojan bumped their EQ voltage to this too, within the last 14 months or so.