Tweaks, money pit or real value?

Minor tweaks are just what they are, minor. Over the years I have found that I do better if I just concentrate on a simple system without too many add-ons. YMMV. 

But isn’t it fun to chase something once in a while? 

True that. Some calls it expectation bias. It’s a real thing. That’s why I always subtract the tweak after a while to confirm that it was really doing something. At the end, one realizes that few tweaks actually work. My experience is that those with no basis in science and those based on quantum physics and nanotechnology rarely translate into palpable improvements, at least in my system.