The jump in temps is normal. TAT raises temps on your processor like no other stress-tester out there.
Again.. if you want better temps on your Conroe then you need to purchase yourself a really good heat-sink fan. This is no gimmick; the stock fans on the Intels suck and will keep your temps much higher. If you want the absolute best in HSFs, you'll go get yourself a Tuniq Tower off newegg.com or performance-pcs.com If you just want "good", you'll go get yourself a Scythe Ninja, Arctic Freezer, etc. And also use AS5 when you put them on. Clean off your CPU's heat-spreader with Isopropyl Alcohol first, though, and use the AS5 very sparingly. Just a very thin line down the middle over the cores would be sufficient.
i7-2700k @ 5.0 GHz
Nvidia GeForce 570 2.5GB Tri-SLI
Asus P67 WS Revolution (Tri-SLI)
OCZ Vertex SSD x 4 (Raid 5)
G.Skill 8GB DDR3 @ 1600MHz
PC Power & Cooling 950W PSU