BPC/Invention question

Playing with some BPC’s I recovered from a wreck, and I don’t understand the wizardry of how industrial skills work with them.
If I have a Condor BPC and say I want to Invent a Raptor BPC, why do the Success Probability Modifiers not add up?
The Blueprint modifier is 30%, Decryptor is 80%, Skills and Implants is 27.5%, and yet my probability of success on any run is only 68.9.

Percents are not all added together. They are ultimately multiplied.

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My advice is just try it. Datacores and decryptors are cheap. You may not be successful, but you learn something.