Dropping a lot gives the best score. Sometimes you don't need to use the bombs (more to drop).
I didn't need to do tricky bank shots to earn extra points.
If you can expose the saw, then drop it, the right aim is all it takes from the following position:
Aim slightly right of center to be sure to drop the whole bundle on the right.
If you are able to hit the saw instead of drop the whole bundle it contains,
that may score more! But, I'm not sure you can pop both left and right bubbles
by going exactly center.
This is one where you shouldn't use the bombs!
All it takes is one hit (if your starting shot is the right color!)
It is better to drop than to make a group. So, if your first shot can match a group, don't do it, hit a bubble in the other area. I have not been able to make 3 stars on this one.
This can go in 3 shots.
No Bombs here.
Drop the middle purple all at once. That is, don't use the saws in that area.
Always so close! Luck of the colors is the key -- keep the streak. Plus, bank shots help. Hitting two groups at once is sometimes a choice.
Still always so close! Even with double-bank shots I can't get this one.
Keep the asteroids for the final drop (don't maximize saw damage).
Final drop was dangling from 2 pink bubbles.
After the first big drop (good saw placement), attempt to miss the remaining Asteroids as you saw away the stragglers. A final brown hit is all it takes.
Three shots. First, hit a saw and have the shooter stick. Next, aim at the left boundary of the center asteroid. If you split it in two you were too far right, and if three bubbles still cling to the center asteroid you were too far left. Just right leave only two bubbles clinging, and that's the final shot.
Pile up bubbles until you get a Yellow, then drop it big. Then, chip away at the remaining flat side until a lot of bubbles are hanging onto the central pink group. Then drop 'em all.