A couple things:
A 4 core machine with hyperthreading will show up to 800% CPU use. It's reported per core.
Not what you want to hear but you may have downgraded Macbook Pros there. Look at the turbo boost speeds for one thing. The newer machines also have poorer cooling so there might be throttling. The Jobs era Macs are still the flagship models. There are a couple of the newer models with insane prices sporting slightly faster CPUs but the thermal issues and the downgrade on the ports and accessories more than offsets that.
OSX 10.14 might be an issue. Not every 3rd party plugin maker or interface driver maker is fully on board yet. Feels pretty beta release status to me so far. There are bugs! So you may want to consider installing OSX 10.13.6. This might cure it and the above dissing on the post-Jobs Macs may be a moot point.
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