2 stages wet and dry?
 

I have the zex dry kit now setup at 100rwhp and I want to add a second kit to spray 50 to 75rwhp with the wet kit on top of the 100 dry. Can this be done?

Dry kit & nitrous in the same sentence always scares me. Any nitrous added leans out the engine. Finding how lean you can go without going too far seems like playing Russian roulette. You can get by some of the time but you just never know when you'll go..................boom.
just my 2¢.

The dry kit is actually running a little rich thanks to the 30# injectors.

Many people run wet/dry setup's but they know exactly what they are doing. How much juice do you want to run all together? What is your budget? Have you ever talked to the guys at nitrous outlet?

But you answer your question, yes.

Not if you make sure the injectors add the extra fuel to go with the nitrous. The LS1 dry kits successfully spray through the MAF sensor, and end up with the correct A/F ratio. The LT1 dry kits typically boost the fuel pressure substantially, to provide the extra fuel to match the nitrous. The OP has an LT1.