^ Spot on advice above.
Your post is too vague to be able to give any solid help on this one.
For the flavour to be worse, maybe your rebuildable coils are higher resistance, and if you haven't increased the power to suit this could be the issue.
Have you used an ohm reader to make sure both coils are solidly connected, and ensured your screw terminals are nice and snug?
If you throw both coil heads into the atty and check the resistance, would be interesting to see how they compare