Hi Kevin;
Sounds like you're on the right track. 1 gallon of plain 6% household bleach in your pool is a little more than 12 ppm chlorine. Given your high CYA level, you'll probably need to think more in terms of a 1.5 gallons per dose, with lower doses if you are able to hold your chlorine level. Use my Best Guess chart (linked in my sig) to determine the correct chlorine level, based on your CYA level.
And, add some acid, to get your pH into the 7.2 - 7.8 range.
Other than that, sounds like you've got the basic idea.
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