You can't cite any extremely old players to support landing on the (initially) back foot. The reason to that being that it was illegal to leave the ground, so the front foot stayed on the ground.
Higher ball toss or more leg strength. You should be reaching up to hit the ball.
[K]Six.One Tour (3) 367.5 grams 31.7 cm balance.
Mains: Babolat/Wilson Natural Gut @ 49 lbs // Crosses: Luxilon Alu Power Rough @ 46 lbs