Another possibility - the 170 stops at Hung Hom station, and goes to Wah Fu - not sure how long it would take in the morning though, as I have only travelled the other way, and spent a pleasant(?) Saturday afternoon in Causeway bay traffic. Might take too long compared to other options.
Also depends where in Wah Fu Rd, as different buses would be better for different parts - eg Kellett school is at the Pok Fu Lam Rd end, giving you the added option of buses going through to Aberdeen (from Central/Western district), but not all Aberdeen buses would be covenient for the estate school.
Maybe best to narrow down the possible journeys, and give them a go.
I believe the web site shows you where the bus stops are, so definitely worth a look.
970X/MTR may well be quicker - just watch out for the 970 though, uses the same bus-stops, and takes quite a bit longer than the 970X !
Good luck, and enjoy your new job!