What tyres are you running and what did you do to get into the sliding situation? For example, did you go in too hot and lift or brake into the roundabout or did the rear break free under power coming out of the roundabout?
IMHO 911s have massive wet and dry grip you just have to respect that there is a big old engine lung out behind the rear wheels. Think of the physics. If you lift or brake while turning some weight will transfer to the front axle and, if the rear tyres already have some lateral loading then the rear may start to slide. You still have a big pendulum out the back so once you start to slide you better hang on. Hence you probably want to brake in a straight(ish) line before the corners or roundabouts. Leave the trailbraking for the track where it is very useful in order to get the car to start to rotate. The rear weight bias is also very helpful. Whether its just the suspension geometry or that and the rear engine, the 911 will squat when you accelerate in a nice even, square manner. So when you get on the power, you get loads of squat and weight transfer to the rear wheels and huge amounts of traction. It is very rare to spin the inside rear wheel, even without an LSD. Provided you don't accelerate too early or too hard you can use the squat/rear weight bias to get great traction out of corners and when the 911 does slide under power, it is (normally) a nice progressive slide that you can just accelerate thru. If the slide gets past about 25 degrees to straight ahead it can be tricky to recover as the old pendulum thing comes into play, but provided you don't lift, you continue to get the benefit of the squat/rear weight bias - hence the old adage "don't lift".
So, on the road, try "slow in, fast out". When there is lots of room and clear site of the road ahead, you can experiment a little. In the dry, try gently lifting a little mid corner and feel the nose tuck in, then back on the gas and feel the rear squat and the nose push wide. You should be able to feel this at just medium speeds - no need for warp factor 9. You will not be sliding, just adjusting your line with the throttle. Sliding is similar just to a greater degree and things happen a lot faster.
The best wet track day I did was an airfield day maybe 4 years ago in darkest, coldest, filthiest November - and then a Ferrari laid oil down on the whole track. It was a little like driving on ice but great fun to experiment - opposite lock into corners and opposite lock out of corners. You may find it hard to believe but I was lapping faster than a 996TT driver who had the instructor with him. he was sliding and using the 4wd to pull him out of the slides. It was fascinating to watch as you could see the torque transfer to the front wheels haul the car out of the slide. In my little car you had just the throttle and weight transfer to adjust your line with. Right up until I ran out of lock on power oversteer, I was doing great !! At that point I had to lift and predictably spin and unpredictably become beached on some tyres!
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