I think this is a feature request for the ClojureScript tracker. Many people have this problem (at least I know), so it should attract attention.
Heroku does not really intend to support ClojureScript (yet) and does much more in terms of hosting than the compiled ClojureScript program really needs. perhaps you can find a provider that will just host javascript and send them compiled.js instead of a java class that runs its own java interpreter.
I agree that not using Heroku is a pain because it has the best (from my experience) integration with git + clojure + leiningen. perhaps either Heroku or Clojure people will fix this soon: - /
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