There's a number of different
tanks available to you that would be bigger. Not sure if they will be better. Innokin iClear 30S and 30B, Aspire Vivi Nova.
All clearomizers pretty much work with the same silica string wicks and tiny coils. Mainly marketed for novices who want something easy to fill and easy to replace the coil heads. Most clearomizers mute flavors, and can be inconsistant in quality and performance.
Not used them personally, but I read good things about the Kanger Aerotank and Aspire Nautilus. Both are clearomizers which use adjustable air control rings to improve performance. A little pricey/ They use pyrex glass.
My recommendation would be to research cartotanks. These use an entirely different wicking method and IMHO provide better flavor and consistancy over any clearomizer. Slight learning curve involved and slightly longer to set up than a clearomizer.
Proper Terminology: Juice Attachments
IBTanked pyrex cartotanks - review
Cartotank Setup Guide


Nautilis and Aerotank

MVP's with IBTanked pyrex cartotanks