I'd like to start this by saying that I love the Sparring feature; I love the chance at some extra EXP and IMP when I'm dealing with a new king. But, with every bit of love for something, there's always a few grains of salt in the mix. So, I Suggest this;

Once a king reaches Dreamboat, Sparring will no-longer generate IMP.

Once a king starts getting past level 12, building up to each level thereafter is /such a pain/. The pain is only added to when your /one/ spar a day gives you IMP, rather than much needed EXP. even only 100 EXP per spar a day would be far more useful than like...3 imp.

((There's more I'd like to add, but I'm waiting on a response, so bare with me.))