... So trading Eurex futures (Europe) from Sydney (Australia) through Jigsaw add-on at Amp Futures (USA) sounds way too slow as those milliseconds are now adding up, compared to something with "direct market access" such as QTrader (with AMP Futures)? So it sounds like by the time I click on the DOM, the market would have moved using Jigsaw. I'm sim trading with TT, but just looking to the future.
It really depends. I don't know if you are/were into competitive videogames but if so, try playing stuff like CS:GO, DoTa or Overwatch with a 200ms ping. There are reasons why those games have a dedicated server for each region.
So if your strategy is time sensitive, I wouldn't even consider trading EUREX from Oz, since no matter how good your setup is, you'll always be at a disadvantage compared to the guy who is sitting in e.g. the UK.
Trading EUREX from Oz through a Ninjatrader Add-On sounds terrible though...
So two possible options: trade your home market, expand your timeframe or tweak your execution from agressive to passive and make sure you use stops that are located on a server close to the exchange.
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