Maybe the fuel pump? i didn't read the whole thread, but maybe throw a pressure gauge on there if you can.

Biggest issue when dropping the rudder is lifting the boat off the trailer so the rudder clears when you drop it.  Actually replacing the rudder should take about 10 mins with a helper assuming it sheared off cleanly.

But a rudder shouldn't just fail.  Was it ever bent, repaired, grounded?  Ever strike anything?  Reversed into a sand bar or a mound at the boat launch where people power load?  Or were you running crazy ballast, listed, cavitating?

Suppose it could be a casting failure but that's an uncommon failure for sure.

I was surfing left and suddenly the boat took a hard right turn and wouldn't stop! Well it turns out that the rudder sheared off. 2018 T22 Axis with 550 hours. I ordered a new rudder. Is this a DIY job? Any tips or videos on installation would be much appreciated. I can't get into the dealer for a little over a week and it's high surf season. 

I have new exhaust manifolds w/cats coming thanks to @justgary.  But in the mean time I've been still trying to chase this issue with the boat going into bogged down state.  It is a very uniform burp...brup....brup....brup.  Only happens if I hit the throttle hard at between 29mph - 34mph or so.  Pulling back on the throttle exits the state and it purrs again.  If I throttle up in a non-aggressive way it goes from idle to WOT purring just fine with the expected rpms and wot speed.  It feels a little like a fuel starvation but it's very uniform, almost too uniform so much so it feels like an ECU induced state.  Once it enters this state it will eventually (usually) fight its way out of it but also reducing throttle causes it to exit the state immediately.  My question is, would the fact that I now do not have any cats at all be something that could cause this and I should stop chasing this until I have the new manifolds/cats installed?   BTW, I dig open up the exhaust and cleaned out any remaining cat material and scoped the entire exhaust to make sure no material was stuck in there somewhere.  Of course the post cat O2 sensors are throwing errors which I'm just ignoring but I wouldn't think that the post O2 sensors erroring would cause something like this.  I would expect maybe the pre-cat O2 sensors to affect engine running conditions but the post-cat O2 sensors I would expect to just throw errors.  Am I wrong in this thinking?  Could the fact that I don't have any cats anymore and the resulting post-cat O2 sensor errors causing the ECU to do weird things during certain throttle changes?  Really appreciate any insight.  I did put a new fuel pump in because the pressure although good most of the time, the regulator wasn't holding pressure at key off.  Figured might as well replace it for that reason and maybe it would fix this other issue as a  side affect - but no.

1 hour ago, dizzygti said:

My 10 hour was free.....and that's when I stopped going to the dealer for service.   

As I like to tell my kids, your 10 hr was not free, it was included.

I ensured that my 10 hour was documented on the purchase agreement, otherwise I would have been charged for it.  That and the recall are the only times that they have touched my oil.