Would it be better to have Mace Triple Attack (minimum 60 damage) then get a Padme attack for a total of 80 damage, or would it be better to do the Shatterpoint/Padme thing for only 40 damage? Granted, yes, Shatterpoint will help you on future rounds as well. But honestly, I would only recommend using Shatterpoint against pieces that have very high HP and you need the Shatterpoint to help whittle them down. And I would also definitely not use it against pieces which have Lightsaber Block, as you'll find the crit attack will do no damage often anyways.
Shatterpoint is just so hard to use. With the 15% chance of getting a crit on normal attacks (So, with Triple, you have a 39% of getting a crit, add in Riposte with MOTF2 and that goes up a lot), the odds are you'll get crits from Vaapad often enough that you sometimes don't even need Shatterpoint. It's a fun idea, and your squad build with Padme is about the best you can do with it, but don't get wholly connected to Shatterpoint.