You could try the
madvapes or discountvapers versions of the gs-h2, you could try the iclear B line (16B and 30B) ...its hard to say without more information. In what ways would you like it to be better? Be specific - tell us what is not good enough about it and then we can offer more specific advice other than - try all of the other bottom coil clearos.
Not sure if this is a consideration or not - but maybe looking into cartotanks if increased flavor and vapor are what you are seeking.