I think the metronome should be used as a jury but not a constant partner. You really need to know how well you do without it and with others--whose time skills may vary. Many of us to one extent or another try to overcome the technical fault of moving a particular tempo to one that "feels" better-its almost a physical thing where you have a swinging act that use lets say your fabulously swinging favorite walking bass pattern and you push it through against the reference point you use for that act . The problem is you find the reference point you use is movingthats where the metronome comes in to rein you in. How do you get past the point when youre constantly disappointed at the results of the jury? One thing I have tried to do is to develop a wider palette of tempos. For example if you do big division of tempos 60 120 180 240 300. Then divide between those 90, 150, 210 then divide those,etc . Perhaps write a tune or a line for each subdivided tempo. I think the idea is you dont move the tempo because you hear that one very clearly and how it flows. This is similar to pitch training only you are hearing rhythm as the color.