the "shifu" i went to too say, don't bother so much about the dates since we had already set mind on our anniversary date.
in general if the date is fine for marrying then fine already. as for clashing, he mentioned that those clashes just stay one side when the bride is entering. thereafter will be fine to go through the ceremony.
unless we are really so "pantang" want exact good dates, he can do that for us, using both parents' and our birth dates. and most probably, such dates won't be what we had in mind.
to save the trouble, we decided on the former.