The 70, 70 rule is easy to remember so everyone uses it as a baseline for noobs. I think after a while of personal experience you will find what works best for you. Mine stay between 65% and 68% depending on which shelf and which hygrometer I read. The humi itself doesnt fluctuate just my impeccable equipment shows a difference. The old man that got me started in this hobby 30 years ago taught me a few things. If you puff too fast it overheats and can cause a sulfur taste. Same thing if you puff too strong. Those are both changed by the size both rg and length. As you smoke the oils from the tobacco are drawn out and accumulate in the unburned portion of the cigar and that is what typically causes the good flavor profile changes. Smoking too hot will cause the oils to burn rather than evaporate and condense back on the leaf. It is usually a fine line between too hot and too cold but with practice you will get to the point you know exactly how to work the stick you are currently burning. The last thing he taught me was never hurry a cigar if you have 30 minutes and want a smoke but cant go past 30 mins you should probably wait till you have more time. Cigars are a leisure experience to relax with a good drink and good conversation. (I dont talk to myself while smoking my cigars no matter what anyone says)