Hmm it is not a bad flash ! It's becuase the damage you did previously to the traces around the bank switch have not been fully restored !
I guess you are lucky the chip works ! It's not going to be easy to fix it now by the sound of it , i guess it's all balck around the area and hard to see what you are solderring to ?
You could leave it as is with one good bank or you will have to try and buzz it out with a multimeter and see what is not connected properly and try to restore all the traces to the right places !
HackDaBox !