Hi, I would like to ask same question. Im running S9, L3+ and D3 with "tubes" attached to fans sucking air from the outside. It was running same temps as yours, the worst thing is, when i attached pipe to blow the hot air outside, temps was almost the same! I dont kniw how the S9 ans D3 can be cooled in the summer...
Do you have a window open or some other air movement in the room to facilitate airflow? If it is just exhausting out the window you won't see much of a temp drop if it continues to draw from the same flow of air.