Hello friend, thankyou for your question.
I do understand you are trying really hard to make a perfect world for your precious baby girl. And I think that's terrific!
The formula you should stay with is the one that lets your little girl "poo" or have bowel movements with little strain and discomfort and without spitting up alot.
Sometimes the formula used is one like The Parent's Choice,Purple as you have used because it's kind to baby.
http://www.parentschoiceformula.com/?deptid=333&phrase=gentle-milk-formula
If baby is not having a difficult time with her bowel movements it's best to not change again. Let baby adjust and if you need to add a little dark karo syrup(like a tsp.at first,shake well,then warm to room temp) and this may help if you feel she is having constipation.
Changing too much can really upset a tummy and cause baby to be up when baby should be sleeping.
If you feel you'd like your baby's dr. opinion give them a call..they will help you over the phone!
Here's more information for you:
http://drgreene.healthology.com/childrens-health/article250.htm
Please let me know if you have any other questions?
Otherwise just click "Accept" and leave a positive feedback.
Sincerely,Don
father of many,grandfather
God made children so we'd learn how to love