I am researching leveraged equities within smsf/s currently, as the laws are changing.
There's obviously a trade off between the tax efficiency of a leveraged super investment, versus the higher rate and insurance premium....and the lenders will be sure to build in a smug profit.
Avoiding call risk might be better met by sticking with the smoothing effect of an index tracker like STW (or LICs) and stop losses. Though I am uncertain if stops can be used with smsf loans.