In my very limited experience with Force Master, Battle Forge is great, but I'd skip the Harmonize.
A lot of Forcemaster's turns are spent with a Force Pull Quickcast and then a full round double strike attack (with Scimitar too, probably). This is really cheep, and you'll end up with difficulty spending all your mana. The point of playing a Forge in Force Master is that it gives you extra actions to help you spend down that mana, to make your mana consumption and your action consumption equal.
Battle Forge is an investment of one action, that pays off in actions (and a bit of mana).
Harmonize is an investment of one action, that never pays off in actions (but does make some mana, too).
As an agro deck which plans on using Galvitar as often as possible, actions are your limiting factor, not mana.
Just as a weird thought experiment, has anyone built a Forcemaster book that includes a Goblin Builder?