Everything you have done so far is excellent for the bike but as I said to gain the HPO you are after the exhaust system must handle the intake system(plus the correct tune)
Here are a few pictures of my bikes, well two out of three
#1 Carpenter exhaust not the best looking exhaust on the market but few would disagree that it is the best for HP increase
Sorry I cannot locate a picture of my 2018 Roadster, anyhoo it has the Triumph off-road pipes which give it a bit more growl they look the same as the stock but are more free-flowing with the cat boxes removed.