Originally Posted by
mainaman
how do you know that?
When dealing with issues one should start with the least aggressive means and move towards more radical solutions if needed.
Taping the spine is the simplest way to go first. If there is no improvement in the edge, spine correction is in order.
If the blade is ground wavy then tape could help with better edge but it will not help with straight bevel, but so wouldn't a spine correction.
From the OP's description I suspect that the blade was ground incorrectly , pictures will give us a better idea.