Sauce – Too much port in sauce

Unless there was sugar in your cream, there's nothing particularly sweet about this combination. Did you salt the pasta water to roughly seawater saltiness? If not, did you adjust salt before serving? If your pasta water was under-salted, that would explain the sweetness, since the only significant source of salt otherwise was the parmesan.

Heavy cream is equivalent to 36-40% whipping cream.

In the event that your cream was pre-sweetened, there's not much you could do except add salt and hope the sugar doesn't overwhelm. It's a fairly common technique to add sugar to a salty dish to make it taste richer, or salt to a sweet dish for a similar purpose. But it wouldn't work very well if the cream was very sweet. Since I've never seen sweetened whipped cream except in aerosol dispensers, I can't say for sure.

If "sharp" means too much alcohol left, bring it back to a simmer and cook off more of it, then adjust with more cream if needed.

If "sharp" means too acidic, your options are:

(1) add more cream and other ingredients to dilute the acid (2) try to mask the acid with a bit of sugar (3) I guess you could try to neutralize the acid with a very small amount of something basic, like baking soda. But that seems like a bad idea, it will probably taste terrible.