I have certainly noticed how much better my 400 pulls after a total of a tad over 400 miles since rebuild - so just starting to nudge the revs up.
I'm amazed how much lighter/easier the 400 feels to ride than my 500, I'm not parting with the 400 either, I just love both of mine with their different characteristics.
Your 350 is very easy on the eye, as other have said its a credit to you, feel free to pat yourself on the back with a job well done.