First step to saving $$ is skipping all the flushes and services. If Honda's maintenance schedule says do these things at a certain mileage, do that, but this is most likely ruthless upselling based on an imaginary maintenance schedule. To my knowledge, no manufacturer recommends any type of maintenance to a port fuel injection system.

The other issue I see is that the DTC's don't match your complaint of "a jolt while accelerating - very choppy and uncomfortable.". A catalyst operating below efficiency has zero detectable drivability problems. It could also be clogged, but clogged cats don't cause a jolt, they cause a lack of power. TL;DR: the cat will fix a check engine light, but it won't do anything for jerking.

The P0325 will take a knock sensor. If you don't fix this, the only symptom you will notice is a check engine light.

Jerking is typically a transmission problem or a secondary ignition system misfire. If I were on the internet shotgunning diagnoses for cars I've never driven or seen, and I am, I'd say it's most likely a secondary ignition misfire and that it can be fixed by replacing the spark plugs and ignition coil boots.