I’m not sure you can beat Dirtside 2 for 6mm action. I would like to see a modernised, streamlined version myself. Future War Commander is somewhat marmite, but it has its attractions and depends very much on what you like. Plus it caters for 15mm as well as 6mm. In addition there is a little add on in the back which allows some of the same mechanism to be used for skirmish gaming. also tried some of the others mentioned. I have tried Iron Cow too. Handles lots of AFV’s and aircraft smoothly, but again, there are drawbacks. Of all the flavours of wargaming, in my opinion you have hit on the genre with most variance and least common ground. Good luck. It might be interesting to see how you get on...