I have an Aero 7+ which is very simmilar to your Jet 7. When I first installed I noticed that my CPU temp went from 45c at idle to 48c, not good considering I replaced an aluminum HS with a 60mm fan. Here is what I did, so forgive the size of the post.
I noticed that the 80mm case fan that extracts air from the rear of the case is sitting right next to the Aero 7+ which sucks air from its sides. What this does is pull up the hot air that comes off the HS and suck it right back into the blower between the case fan and the HS/fan. This is not good since the blower is sucking in air that just came off the HS. I reversed the case fans so that the rear became an intake and the front became the exhaust. I also have two fans on the side of the case, one next to the vid card (also intake), and one next to the HD's (now exhaust). My temp went to 43c idle, which is better but not what I expected. I noticed that the now the back case fan was sucking in the hot air that just came from the PSU, so I added a small flap over the PSU fan so that hot air is pushed up, and small flap on the back case fan so that it sucks air from the bottom side. I also went out and bought rounded cables for everything, and placed all of the PSU cable, and what have you into colored round sleeves. This lowered my idle temps to 38c, and 42c under full load running SETI, now this is more like it. It also quieted my box quite a bit????. Note: I had to spin the blower on the HS so that it would fit on the socket without rubbing on the PSU. I also run my Aero 7+ at around 2500-2700rpm not the 3500rpm max with Artic Silver, so I might be able to lower my CPU temps a little further. My apartment is always kept at 70F.
Just experiment, it is a good HS/Fan, plus they look cool if you have a case window.