At your weight, I think the EVO 70 or Quad 71 is surely better even for 5.3. They are not really much more than their quoted volumes, but the flat decks and compact outlines make them feel much, much more stable than the volume might suggest. SO unless you're spending time standing _absolutely_ still (when nothing but shear volume counts), the E70/Q71 is the right choice. And that size will be A LOT better for you as soon as your powered up. I'm around 4 kilos heavier than you and I've spend many SUPER light wind sessions on the EVO 70.
If you still decide on the 75 (which you might, for safety reasons, if you're a bit unsure about your slogging skills), I can add that in my opinion the 09 E75 is a far better board than the 07 version (while in the 70 size the 07 and 09 are very similar).