If you can be productive when you're manic and not harm yourself or do anything dangerous, then don't change what you are doing. If you practise any risk-taking, dangerous, self-harming etc behaviours when you are manic, then you need professional help and probably a med change or dose increase etc. I do not recommend going off your meds. This is just the invincibility of your mania speaking. I do the same thing. Thinking that you no longer need meds because you currently feel good is incorrect thinking. You will increase your chances of a bad episode if you quit taking your meds - don't do it.
Many of the things you describe make it sound like hypomania. If you are not doing anything risky and can control it, then it might not yet be full-blown mania. The last time you had a full-blown manic episode, were you able to recognise it during the episode, or not until after? Surely you know your warning signs or any similar thoughts or behaviours to your last one. If you are still in control and happy with your current level of productivity, then just enjoy it, but monitor it closely. The moment it changes for the worse you need to act on it immediately to limit the damage. Do you have a good support network? maybe you could tell someone you are close with that you are currently experiencing a hypomanic episode and while you are ok at the moment you are ok, that may change. You could then tell them what to look for so they can intervene, if you are not looking after yourself properly.
These are just my personal thoughts, opinions, experiences and observations; but I hope it helps. Keep us informed about your progress and any developments.
Please don't quit your meds without first seeking professional advice.