i have 2010 yukon lowered f/b 2"4" find it great iam old guy like you only thing gotta b careful in and out of drive waysI don't have any experience lowering the vehicle, I am sure others will chime in on that.
In your tahoe, did you set your seat to lower when you enter and exit the vehicle? Would that help?
Do you have running boards? if so are they the fixed? or the retactable?
Also is the step to the running boards the issue or from the running boards to inside of the tahoe?