Trad pole work at height is the black belt of window cleaning. It takes a lot of practice!
I'd always recommend GG3 or GG4 as it streaks less, a soft squeegee rubber, dog eared channel, and Microfibres instead of scrims.
Some ppl swear by swivels for that kind of work,.. but a swivel has a learning curve all of its own, so maybe just try one thing at a time!