Sorry in advance if this sounds insulting, but here goes.
I don't know if you're a newbie at vaping but if you've been vaping the Geekvape L200 for ages with the Zeus tank and 0.20 or 0,25 coils you may simply be accustomed to vaping in Direct to Lung style i.e. stick it in your gob and take a massive cloudy hit -where you inhale it directly into your lungs, apparently this is similar to taking a hit off a bong, instead of vaping in a 'smoking a cigarette/MTL vape style'. If you try this with an MTL tank you probably won't get much flavour - with an MTL tank you must take the vapour into your mouth, hold it in your mouth for a second or two then inhale it into your lungs and exhale. You will probably find you get much more flavour from the juice as you're holding the vapour in your mouth than from the initial inhale and exhale.
The reason I'm mentioning this is I vaped DL exclusively for about 4 years, when I tried MTL again after this extended period of MTL abstinence it had become ingrained for me to just inhale and exhale in a DL vaping style and I wasn't initially holding the vapour in my mouth and savouring the flavour of the juice. Basically I had to make a deliberate effort to vape in an MTL style as after 4 years I'd simply forgotten how.
Going back to the 50/50 juice subject brought up earlier - make sure you are trying a 50/50 MTL juice from a pre manufactured 10ml bottle that is specifically for MTL. if you're used to vaping 3mg nic in the Zeus tank try either 10mg nic salt or 12mg freebase juice. Don't be tempted to buy a 50/50 50ml shortfill as these are designed for DL vaping and have less concentrated flavour. Vaping the higher nic concentration shouldn't be a problem as you will be running at a much lower wattage than the Zeus tank and vaporising/consuming much less juice in an MTL tank.
If you're shaking your head and thinking of course I know this you dumb bastard, just ignore me. If, in the unlikely event you don't, give it a try.