...Which define proficiency nearly identically between the different skill sets. Your relative proficiency for speaking is expected to be worse until you reach native proficiency, where you are still worse at speaking than reading or listening, but it doesn't very much matter in most situations.
> You will not speak what you don't know.
Yes, and what you don't know with speaking is invariably greater than what you don't know with listening and reading, hence why everyone scores lower in proficiency with speaking relative to their ability in listening or reading.
> Starting to speak and be correctly understood felt much easier than accurately understanding others in my two secondary languages
If all my utterances in English were "I go school," "I eat pie," "I clean teeth," native speakers will easily understand what I'm saying. That doesn't mean I'm proficient or that it's easier to speak than it is to listen, just that I can create coherent and correctly understood sentences in English.
Test results and fet experience are not connected.
Certainly listening is easier than me speaking at the same proficiency as the other speaker, but in terms of what matters for using the language on a day to day basis, it is the other way around.
Obviously, everyone's mileage varies, this is just an anecdote :)
You feel more fluent in speaking because you're only working within your own ability while listening you'll encounter things you don't understand or situations where it's difficult to understand things all the time. That doesn't mean you're more proficient at speaking and in most cases you aren't going to be nearly as proficient at speaking as you think.
You will not speak what you don't know. There is no such limit when others just say things in accents, speeds or using words you have no knowledge of.
Starting to speak and be correctly understood felt much easier than accurately understanding others in my two secondary languages, and the same for my fiancée who is a native English speaker with one secondary language.