Winter training - what should I be doing.

So my first mini triathlon season has come to an end in which I completed my first sprint and olympic distance with a second sprint thrown in at the end for good measure. Winter is now on the horizon (I'm south of the equator) and my next tri event won't be until end of September (a sprint) followed by an Olympic mid December. I'm wondering what to do over the winter period to ensure I come back a stronger athlete. Running and swimming are covered however I'm unsure how to approach cycling? At first I was looking at Jorge's winter cycling plan which I believe is aimed at increasing FTP but then I read elsewhere base training is what I should be looking at in off season. So I guess my question(s) are which of the above should I go for and if base training is the choice how much/little for Olympic distance events?

Thanks all!