Firstly, claim to be a scientist? I am a Neurotoxicologist at University of Colorado Medical School getting my PhD in Biochemical and Molecular Toxicology. Feel free to consult the CU Denver Toxicology webpage for corroborating evidence regarding my claims of being a scientist. My username here is my actual name.
Secondly, you have an incomplete understanding of the definition of accuracy vs precision. Of course you use the finest instrument available and go off of the data that you have available. But what you don't understand is that you are chasing a moving target. With an imperfect tool to measure temps and humidity, you are likely to have swings +/- a few percent based off of a flawed system. THUS, getting back to what the OP was actually asking, a 5-10 % increase in humidity when putting in fresh substrate is NOT an issue because you likely have swings in humidity NORMALLY due to hygrometers and thermometers not being perfect instruments.
Bashing a newbie because they didn't do the "necessary" calculations for determining humidity is just not productive, and IMO prevents people from using these forums properly. Regarding data from natural conditions, humidity in sub-Saharan Africa oscillates between 70-95 percent relative to seasonal rain (obviously). Therefore, even a 15% increase, and a temporary one at that IS NO BIG DEAL.
Also, you're in luck regarding not hiring. I seem to have a pretty lucrative career as a biomedical scientist.
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