It is not necessary to shock a pool every week. The only time you really need to shock is when you are having issues of some sort --- cloudy water, CC reading over 0.5 or after a really heavy bather load or if a heavy rain drops a lot of debris into the pool.

If your chlorine readings are correct, (I am assuming that by CL you mean TC?), then you have a CC reading of 2; thus you need to shock the pool. (FC+CC=TC)

All your other numbers look fine. If your CYA is 30, then you can use the trichlor tabs for awhile but if your CYA is 50, then I would not use them anymore because they will continue to add CYA and 50 is about as much as you want for most pools.