If you don't mind trading a penny of mobility for a pound of comfort, the DW DWCP9100BR backrest makes a nice upgrade for your drum throne. The DWCP9100BR is compatible with Airlift Series thrones.
DW drum thrones: building a better foundation since 1974
It may come as no surprise that DW's venture into drum hardware all began with a throne: the height-adjustable DW trap case seat. Not only was this the first of DW's many breakthrough hardware designs, but it showed the world that it understood what drumming is all about.