Enlarge still only has a one minute duration, and you're tying up two concentration slots to get it done, and Machine's Load has no combat utility above what Enlarge already does. At low level, that's a not-insignificant amount of a party's daily spell power.

It'd be a great combo in certain circumstances, like when you need to lift/shift heavy objects, but to be honest I'm ok with that. It's a niche enough scenario that I don't mind PCs being able to use a couple of spells and be satisfied about their cleverness.

I'd be tempted to let Machine's Load bypass the Str requirements of heavy armour though.

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