You ask whether your husband's LEDD of 1110mg is high. Certainly, it is higher than the mean for the whole Parkinson's population, including those just diagnosed. That is not the same as saying that it is higher than it should be. Neither, without knowing more, would I describe it as unusually high.
There are many factors to consider, these include:
-the time since diagnosis;
-the time since first symptoms;
-the progression of the disease;
-the size of the patient;
-although there is no consensus on this, some people may choose to go undermedicated in the hope that it delays complications arising from the medications - however,some people argue that undermedicating speeds progression;
-regional differences, the mean preoperative LEDD before DBS is 808.5mg in Europe and 1074-1409mg in North America (Lee et al. "Daily dose of doperminergic medications in Parkinson's disease ... ", Neurology Asia, 2010.)
Rather than start with the LEDD, I think we should all begin by asking the question: Are we doing well? Only if we are doing badly should we and our doctors look at the LEDD to help inform us on how to improve the situation.