I think only volleyer way play can beat the Incredible LEVEL.
BASE LINE PLAY max CAN BEAT THE MASTER LEVEL.
I try many time to play against the IN 10 level.
if power 80-100 serve, then AI will return can make me volley error easily.
if power 0-20 serve, I will lost by AI's return winner.
half power is the best way to serve for volley and avoid the AI return winner or self volley error.
for return serve, use the lob shot for all.
but this way to play against the volleyer or varier who come to the net will getting more diffcult. sometime depend on luck.