My 2011 Softail standard has a problem of fouling plugs.

I have 2011 fxst   have stage 1, SEPST,  S/E heavy breather, and SE slip ons.

I could only dream of 400ks. 

That is a good plan mate.

Any recommendations on tuners in either Frankston or Dandenong areas?

1.  Did this just start like magic?  Or was there a tweak or change prior?

I purchased the bike a few months ago. It ran fine as it had new plugs installed.

They easy enough to get out but I would bet my lefty that the culprit is the tune, no way an F3P could do a decent job with 259's, there are good tuners in Melbourne but they will all want to use something other than what you currently have, if you go with it you will love the result.

Will add though if it's using oil the valve seals or rings could be causing the fouling.

Does not appear to be using oil

Yeah, I recon your on the right track here.  Assuming all else is okay then even Autotune will not make much of a dent in a Map thats well and truly not suited for the engine build.   I have a Thundermax and found a canned Map in in the ones they supply that pretty well nailed my setup on the Sporty, so have never had any issues to date other than when I have over tweaked things as i play around with AFR's/Timing etc

Problem solved hopefully.

well done, thats how easy it is, send over internet and put on bike

Good result.