Heat from the coil is related to the coil's structure, the resistance is just the outcome. Instead of thinking in terms of resistance you want to look at the coil properties. What's gauge wire are you using, what is your coil internal diameter, how many wraps? How close are the coils to your air intake? All that can make a big difference. Then the next vape property is wicking. The only question here is how efficient is your wick for your particular build?
If you an post a picture of your coil and wick we can get an idea of why you may be getting a hot vape.
If you check out
Coil wrapping | Steam Engine | free vaping calculators you can plug in the numbers for your build and vary the heat flux by wattage to get an estimate of the vape temp (cool-warm-hot). The idea here is that number of wraps along with coil I.D. with a particular gauge can get you similar resistances with different amounts of surface area.
Also, sometimes people use high nic juices on their RDA which can result in a harsher hit.