Ideal Shift points for 904

Ok ill make it a little more simpler, before I swapped rear ends I had a 7 1/4 with 2.76 gears Stock Steel 15 inch rims. 1-2 used to shift about 15 mph and it would be in 3rd gear at 25-30 mph on smooth acceleration.

Now I swapped a 8 1/4 with 3.55 gears, same rims and 1-2 shift is at about 10 mph and in 3rd gear at or before 15 mph under smooth accel.
I will get RPM shift speeds tomorrow. Ive been going off the speedo.
Would the now taller gear ratio be the cause since RPMs are higher with the new ratio?
Would an adjustment of the kickdown be needed after changing gears?