With that kind of bioload I feel that you should do alright without a skimmer. You have a fair amount of LR. Adding miracle mud wouldn't hurt but I have run a tank and have had friends that have tanks that run skimmerless and as long as there is a good CUC, not too many fish, regular water changes, and lots of good live rock, there has never been a problem. In fact in one of my friends tank, he has some of the best looking coral!
Garrett