I'm in the middle of revising the four interconnected novels over at purchas. I wrote them very fast- in less than a month each- and with very little forward planning. My main mistake- first time round- was to introduce a new villain in book # 2 when I had a perfectly amenable and very similar one to hand. That has been rectified. I have also rewritten a chunk of the second book where the action was particularly implausible and one of my people was acting out of character. Otherwise it's been a matter of going over the surface with a soft cloth.