Oh and I know that's the max output but even on low is it too high?
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High heat tolerant food grade silicon tubing is fine. In fact several people I know use this with quick connects and it makes ofr easy cleaning and maintenance.
Any sort of propane burner will be fine for MLT and kettle although try to find one that operates quietly and efficiently.
But again to reiterate, making good beer is about using best practice, not best equipment. It is true that having a proper set up makes for an easier more efficient brew session so that does help but if your practices and processes are not good, neither will the beer turn out well.
If you listed specific reasons or issues you have been having with your beer we can certainly assist you in determining where improvements can be made:)