The source of the weirdness is definitely not this mod, the boost system only appears at Tier 3 and above. You've got something else allowing the cyberware to spawn early.
Alternatively, I also made a file that, in addition to making it additive, also inverts the behavior. Kerenzikov Boost System will make enemies slower, not the player faster. For Legendary++:
Kerenzikov Time Slow for Player: -60%
Kerenzikov Time Slow for Enemies: -60% - 19% = -79%
yea, with this mod you are close to the appoge sandevistan that slows time by 85% because this mod makes kereznikov slow time by 79%. the biggest difference is that sandevistan does not slow your movement, while with kereznokov you move 2.5 times slower
(well mabye not quite close, when you do the math sandevistan slows time by 6.67x and this mod makes kerevnikov slow time by 4.76x
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Tier 1: Slows time by +7%
Tier 2: +7% (!)
Tier 3: +5% (!!)
Tier 4: +10%
Tier 5: +15%
the biggest difference is that sandevistan does not slow your movement, while with kereznokov you move 2.5 times slower
(well mabye not quite close, when you do the math sandevistan slows time by 6.67x and this mod makes kerevnikov slow time by 4.76x