Hi, and welcome to the forum.
I played powermonger on winuae a few yeats ago, and the sound was great. Is there any particular reason for you not having sound emulation? Actually, I preferred playing on winuae to a real amiga.
I vaguely remember a save game issue. It seems that the game had a strange format for its save game disc (see
here). When I played it, I think I was able to download a special save game disc, maybe from back2roots website (which now appears to have died). I guess if someone made a real save game disc, from an amiga, and then made it into an adf, it might work. I'm only guessing though, and can't really remember clearly how I did it before.
Good luck, and maybe some other members can offer you more help.