Some help !

[1275mini]

just changed from 3s to 4s on my 550 changed the props to the smaller one form the kit my problem now is the hexa is drifting all the time now never had this on 3s and bigger props gains are 135 135 125 130 Basic Gain
135 135 Attitude do i need to alter them ? and what does what ?

 

[Aviator]

just changed from 3s to 4s on my 550 changed the props to the smaller one form the kit my problem now is the hexa is drifting all the time now never had this on 3s and bigger props gains are 135 135 125 130 Basic Gain
135 135 Attitude do i need to alter them ? and what does what ?

You may find lowering the gains slightly will help as now there is more thrust vs weight the gains need not be as high?