"ST_1stService%" is the stat, not the skill.
Change these line to raise your service skills :
Service_Power = 75
And it's surely possible to do ace against the CPU in Level 3.
The slice helps a lot when using b1, but b1+b2 without effect should work sometimes as well...
== Mana Games ==
>> I don't answer Private Message, except if it's really a _Private_ topic <<