Seems the main fallacy in the OP here is equating "good serve" with "big serve."
A serve can be pretty good without being particularly impressive, if the server can place it where he wants to, mix up pace and spin a bit, and not fault. Serve quality is determined by serve results, so if...
All the still-unsolved ones (I think):
Audio booster, every, takeout
Building level, age, predicament
Holy golden air freshener
Poison ivy on a cold day near the Golden Gate
Did I miss any? Here's one more:
The conqueror unlocks the legendary city.
Nope! But that's ingenious. And you're going the right direction with "ursine."
These may have been a little obscure.... if nobody guesses by the end of the day I'll try to add a little more detail.