Yeah my alkalinity goes down little fast
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If its going down THEN you raise it back up that's probably your biggest problem, no stability. You want to keep ALK very stable to keep sps happy and colorful. Do you use a ATO?
You need to figure out your daily uptake:
Slowly raise you ALK to desired range, say 8 dkh
Stop dosing for 3 days once at 8
After the 3 days test your alk. Subtract that from 8
Check your alk solution's directions to find how much ml per gallon you need to make up the amount depleted
Take said number and divide it by 3 for your daily dosage.
Do calcium and magnesium while you're at it!