I do get that eggy taste with eggs from certain brands . Try eggs from a different store.If doesn't work, try a third store until you find the brand that works for custard. I'd try one yolk at first to avoid wasting too many.
From this website:
What does mesh size mean?
Figuring out mesh sizes is simple. All you do is count the number of openings in a one US inch of screen. The number of openings is the mesh size. So a 4-mesh screen means there are four little squares across one linear inch of screen. A 100-mesh screen has 100 openings, and so on. As the number ...