Final Submission
Monohm
53 HP / 40 Atk / 58 Def / 67 SpA / 55 SpD / 55 Spe
Base Stat Total: 328
Duohm
88 HP / 40 Atk / 103 Def / 77 SpA / 60 SpD / 60 Spe
Base Stat Total: 428
While working out these stats, I primarily was doing comparisons to two other Pokemon and their families: Haxorus and Magnezone. Haxorus is the third stage Dragon type with the closest BST to Cyclohm, while Magnezone was an electric type with a close-ish BST that, like Cyclohm has three pretty good stats and three not so great ones. Because Magneton is kinda a weird case due to having formerly been a fully evolved Pokemon, I based my BSTs more off of Haxorus's family, but I did reference Magneton a lot because I thought that Duohm, like Magneton should also excel pretty well at the thing its evolution is best at.
Looking at Duohm, the main thing I wanted was for it to remain physically bulky. This, far moreso that its special offense was the trait that I wanted it to excel at. So, while all stats go reduced somewhat, I made sure that the biggest loss was from SpA so that the other stats could drop more uniformly, leaving its high physical bulk still good, and its weaknesses weak, but not ridiculously so.
For Monohm, on the other hand, I do not believe it looks physically bulky at all. If anything it looks kinda frail. While I don't want to massively change the overall stat bias of the family, what I did do was make the biggest stat drops come from HP and Defense. Every other stat only received a minor drop, or in the case of Atk, none at all. So, while this did not suddenly turn its defenses into its worst aspect, Monohm would not be a much more well rounded mon, with its best aspect being offensive, which I believe fits it.