Increasing Drop with heel cups

I purchased a pair of NB SC Elite v4 not really looking at the drop. After a smooth 7mi run in them, my Achilles were killing me for a few days after. I do my daily runs in Vomero plus and Boston 12 with 10mm and 8mm drop respectively. I didnt realize the SC v4 were 4mm. I read that I can use heel cups to increase the drop. Do they work well? I like the way the NBs felt but the pain after was not fun.