Innokin ares 2 rta on drag x

[alexandra.1029]

Hi, i use drag x kit by voopoo with factory coils and recently i bought the rta ares 2 by innokin (and also the drag x adapter in order to put rta atomizer) so i'm new to rebuildable atomizers. The thing is that it doesnt read the ohm, i have to loosen the screw at the bottom of the atomiser in order to do and even then after some time the ohm disappear so i have to do it again. Also, when the above stabilize for some time and i'm able to take some vapes it's tasteless. Thanks in advance!