First thing first: increased your fan's speed, mostly likely, will only knock off a couple degrees. Same with adding another fan. Might not be worth the noise. Your expectations for how well your new cooler might work may have been a bit high; it is for a lot of people. Although, I think the i7-9xx series ran a bit hot. I could be completely wrong.
Anyway, how did you install the cooling unit, more specifically, how did you apply your thermal compound? (Are you using the stock compound?) Cooling unit aside, does your computer case have adequate airflow: no blockage from wires, proper airflow? These are the core factors to look at.