I very much doubt that your pool is 27,000 gallons. We have an 18x36 with a 7 foot deep end that only holds 19,000 gallons. Yours is presumably more than that, and 22,500 sounds around right.
Regardless of that, you should give the salt 24 hours to mix in, and then test the salt level before adding any more salt. Any time you are making a large change in any level you want to approach it cautiously, take one step, test, and continue adjusting from there.