Shocker-Far-Swish, Bird-Crowd Pleaser, Bounce-Blimp, Dumpster, Near-Swish*3. The Blimp-Bounce-Near combo would get the game down to 6 shots, and I think that may be the lowest possible.
If you want the numbers I used, I’ll put them in a spoiler box (angle, power), you may have to wiggle them around a little bit, the game seems to change slightly each time:
Shocker-Far-Swish: This one is picky, so you’ll have to mess with it a bit, but I’ve found that these three have worked in the past: (46, 32.5), (47, 34) and (45, 36). Try numbers in that general area.
Bird-Crowd: (82, 40) usually works. Just get close to 82 as the angle and pull back as far as you can.
Bounce-Blimp: (-20, 10)
Dumpster: (60, 24)
Near-Swish: (-13, 9)
I didn’t write down what I used to get all the challenges with a bounce off the floor, by I know all but one are possible.