Well, I'm not sure cause I don't know what the load is. (How many amps you want at 30 volts) But lets say you want the 1.5 amps that the chip puts out. Your numbers are correct, but the ripple will be as low as 30.75 volts at 1.5 amps. If you allow 3 volts for the regulator to regulate (the only spec. I see for this one) then you are down to 27.75 volts. If you want to take in low line voltage you might be as low as 25 volts that is actually regulated.
Several things you can do to get a little more:
Schottky diodes in the bridge. .8 v
2X3300 Ufd. 1.25 v.
Lower drop out regulator 1 v. (Careful most LDOs are only good for 30 volts)
Ignore low line 2.75