Diagnosis of problems from typed descriptions on t'interweb is never a good idea, but CV joint problems start with a 'clicking' or 'ticking' noise, usually associated with one side or the other, and usually when cornering and not applying power. The joints wear such that the balls in them are free to move fractionally when there is little torque being transmitted through the joint. When you apply power, the torque transmission is high and the balls are clamped in place so the clicking stops (but this doesn't always apply). It will happen in all gears, and can often be pinpointed to one joint from within the car (although if it is one of the inner ones, it can be harder to determine which side it is.)
A badly worn CV will not transmit the torque as well as an unworn one (and will transmit it coarsely), so can cause the car to pull to one side or the other, although I'd have thought it would have to be pretty worn for this to happen (particularly on a RWD car.)
I have never had a problem with the torque tube, but wouldn't have thought that a failure here would cause the car to pull to one side or the other - it drives both rear wheel equally, via the differential in the greabox. Having said that, a problem with the torque tube may cause the gearbox to be twisted, which could cause a pull to one side or the other.
It may be helpful to get under the car and give the drive shafts a good wiggle. There should be very very little lash in them (although a fair amount of endfloat) - twist them by hand and see what happens. You may be able to spot a worn CV in this manner. If you take the driveshaft off and take the CV joint apart (messy, but not hard at all) you will easily see whether there is any wear on the drive faces - the surfaces get pitted when worn, which is very easily seen.
An alternative option for diagnosis would be to take the driveshafts off and fit them to the other side of the car (left to right, right to left). This will reverse the drive on the CV's - using the 'other side' of the drive faces. (It doesn't matter which way 'round the driveshafts are bolted on, you just have to swap them from one side to the other. If you doubt this, work it out with a pencil and paper. Hint - look at where the drive is applied on the inner and outer joint.) If this cures the problem then you know you have a worn CV joint, but the clicking will now occur in reverse gears instead of in forward gears.
If you DO start taking driveshafts off, you'll find that they are held on with bolts with an insert head. Do buy the right tool to undo these with - it's called a "triple square" or "cheesehead" or "spline drive" tool, and should cost around a fiver from a good tool merchant. And take care - removing the drive shafts is easy, but if you mangle the head of one of the bolts then you are suddenly into a world of misery. Clean the head out carefully with some spray cleaner and ensure that the tool is fully inserted before putting any force on it.
Oli.
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