Hi monkyclimber, welcome to the forum
Indeed you can use any atomiser with a 510 thread fitting like the CE2's, 3's and 4's, although I am concerned you are having problems with the eGo-C.
When you fit the tank into the atomiser, make sure it is pushed in all the way, there should be no gap between the Tank and the atomiser. Also when you fill the tank make sure there is a pocket of air left in the tank otherwise you will start to get a burnt taste.
Try taking long light
vapes (at least 5 seconds) and not short hard vapes, press the power button slightly before taking a vape, taking long vapes allows the vapour to develop creating a more satisfying experience.
Problems with vaping can often be down to vaping style.