I been doing street riding and now racing for 2 years so far. Currently podium on intermedium level and mid pack at expert level.
I used to race stock, then I put 30mm front and ttx36 a few months ago.
The difference between yamaha’s stock suspensions and ohlins is just a fraction of a second a lap, major improvement is on a better feeling of the track and what the tires are doing when leaned up to the very edges of the tire.
Since you described yourself as a street rider and ocasional track day participant, I suggest you not to spend so much money on ohlins. It doesn´t worth it.
Given you weight you are a bit over the stock spring suspension range. Put new springs for your weight, set the suspension properly, and you are done.
Most of the time people says ohlins are su much better is because they were running on stock suspensions with a burned/degradated oil (no servicing), improper suspension springs for their weight, improper damping setup. Then while switched to ohlins, the springs were choosen right, fresh top oil, and ohlins already provides you a good base damping setup for most conditions.
just my 2 cents