if I have additional funds the way I managed my debt on my managed funds and Shares is as follows:

I will pay down my debt when I believe the market is at a high.....

and I will increase my capitial base/fund additional borrowings when the market(or underlying investment) is low.

its a conservative strategy but will help you avoid margin calls and become positively geared sooner rather than later. It follows the buffett aproach of being fearful when others are greedy and being greedy when others are fearful.

it stopped me having a margin call over the last 12 months, but it didn't stop me making a paper loss !