Went to a private group with a friend and started to get the upscaled defense after heart 3 went down.No (zero) issues here either.
Done a couple of solo Titan excursions for each heart, averaging about 50M bonds per heart so far, individual bombing runs anything from between 500k (missed the vents / got lost trying to get around the titan and couldn't get in range / headbutted Titan / other user error) to 12M+.
The only trouble I'm having is the local Titanic defences steadily stepping up their game, with orthrus shutdowns, hunter (I think) missile attacks, swarms and piles of scouts becoming more and more prevalent (especially when NPC pilots are in the instance.) But I assume that's working as intended.
One run had me tanking 5 interceptors. 2 were hunter class.
Run to the edge of the rocks and wait around in the "safe" zone and they eventually go away.