I mean OP has listed their power target, and has also stated that they have gone through no less than 3 engines at, I assume, that power level. Either OP has the worst luck in the world or a bad tuner OR the engine isn’t necessarily as reliable at those power levels as everyone claims. Now, I will absolutely acknowledge my lack of experience here, since I’m essentially on a stage 1 stock engine, but given all of the data OP has presented it’s pretty easy to just recommend he go with a larger displacement engine. I’m not saying the 1.6 is a bad motor, but clearly for OP it’s just not working for them/their tune/their driving style. A stock tune 2.0 is going to be more reliable than a 1.6 with the wick turned up by 30-40%. It’ll be a bit of custom work, absolutely but being that OP has been through 3 engines in various states of build, I’d assume they are willing to deal with a little custom fab and as far as ECUs go there are plenty of aftermarket ECUs and you could absolutely set one up to run a stock tune. The easier route, obviously, would to just be swap the FiST for a FoST and pull weight out of the FoST.
My .02
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