TFA DX Hazelnut is pretty good, I also use FA Hazel Grove (Hazelnut) but FA can tend to be… Woody tasting, if that makes sense. DX is more creamy. A lot of people also like FW Hazelnut.
As for the coffee, I have gone through a lot of coffees, and for me they taste burnt. Be easy with the coffee, low %'s until you know how it plays.
Sweet Cream of any sort will also help as well as sweetener such as sucralose or stevia with the sweetness.