Need a little help with 4-6 shifting and tune

so got a 16 Tacoma 4x4 auto and its leveled now with 285's but even on stock wheels n tires in 4th gear on the highway i have to almost lift my foot to get it to shift n 5th and same for 6th took it to Toyota cause my 100k powertrain is almost up and they said everything looks great and no issues... anyways thinking about ordering the OV tune and see if that might fix up my issue has anyone else expierenced anything like that and did the OV tunes help shifting better? thanks.

 

Yes

 

Hey thanks that’s exactly what mine does least little hill back right out 5th into 3rd and do u find on yours it feels like some times ya have to almost lift your foot of the gas pedal a bit to get it to upshift into 5th or 6 th