You can easily check your chainline. Shift the chain off to the inside and then use a long straightedge or known straight yardstick. Push the straightedge up against the face of the chainring with the other end extending back to the rear cog. The end of the SE should be in line with the same side face as the chainring. If it's not it'll show you how far out it is pretty quickly. If you're within an 1/8 inch you're likely fine and there's some other reason it is skipping.
Are the ring and cogs you're using single speed types where the teeth are fully shaped or are they intended for multi speed setups so the teeth are tapered so they can shift easily? And if they aren't SS/Fixed rings or cogs did you double check to ensure they are mounted so the reliefs are facing the right way? (shot in the dark since it sure seems like you know what's up)