Frankly, if you want clouds, the best next step is to bin the pre-made coils and start experimenting with a rebuildable atomiser.
can't remember the last time I saw anyone using shop bought coils in a competition situation. no. never. they don't. simple. they tend to use RDAs, not stock tanks.
this lets you play with surface area to ramp up balance and wicking techniques (every bit as important as the coil itself) etc etc etc.
and you don't need crazy wattages to do it either - but you get more clouds. (damn, will I regret mentioning this now? lol)
BUT you need to do it properly and (yes, that boring word again) SAFELY - for which you need knowledge and the correct equipment. that's why many of us us have meultiple devices
I don't know what clouds you're producing but click on this video nd fastforward to 7mins 30:
this guy is producing pretty big clouds at only 55watts as he's made a decent (but fairly simple) build in an RDA.
(PS a replacement coil for him is about....... ooooooh....... maybe........5p yes, not £5 but 5p!!))
Maybe it's time to start experimenting in different ways?
you know, we'll happily answer any questions if this approach interests you