Hi, Matthew, and welcome to the Pool Forum!

RE: CYA ----- if you get a read of 100 with your K2006, that means it could be 100 or any number higher than 100. Dilute a sample with half pool water and half distilled water and then run the CYA test with that mixture and then multiply the results by 2 and see what you get.

How many trichlor tabs do you have left? Your CYA is already too high and using the tabs will continue to add more and more CYA.

RE: pH --- You will want to lower it some but it will go hand in hand with lowering your alk. Please read the following two threads:
http://pool9.net/alk-step
http://pool9.net/muriatic/

RE: Hardness --- For a gunnite pool, you want the hardness to be 200-400. You might want to use some cal-hypo for awhile to bring this up.

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RE: Scaling ---- is usually a result of high ph + high TA + high CH.