Personally, I have not seen an issue using Nolva for my SERM in PCT. In fact, I find that the side effects are much lower. Clomid has a bad rep for making guys feel emotional. If you can handle that, or if you are lucky enough to not get that side effect, it is great for helping you recover. I would certainly not use both together. Super high doses of SERMs, or combinging 2 SERMs, each at a standard dose, is more likely to cause side effects. IMO, one SERM is good, and adding in HCG though the cycle, up to a few days before PCT, is going to be the best possible second drug to use for recovery.
I have extended Nolvadex longer, when I haven't felt recovered, for instance, wk 1 40mg, wk 2-3, 20mg. then continued on for a couple wks at 10mg.