You have not provided enough details on your situation for people to respond with specific useful advice. It would seem you're in steady employment, over 49 years of age and cautious by nature. Need to know all sorts of other information such as age, remaining working years, family situation, experience with development etc to make conclusions. Interesting that your accountant has profiled you as someone that could benefit from property via smsf. I think you are right to at least start researching this area so you can make your own mind up. It appears to me though you have a project to get your teeth into outside of super with your present IP, so that's where I think you should be focussing first. For some passive investors investing via smsf can successfully turbo-charge their portfolios (such as see_change) however these people are generally running pretty hard with their non-super portfolio in the first instance, and that is not your situation as I read it.
Read, learn and keep an open mind though....maybe if the property next door to your existing IP came up for sale that could provide a chance to employ the smsf strategy, for example. In general though its possible you may achieve a better overall balance with direct property outside of super, and exposure to interest and equities within super as you likely have now.