tips for improving corner climbing ability??
get used to moving more dynamically in corners - staying still and moving slowly between freeze-frames is hard work
moving confidently and not stopping after every move makes it a lot less strenuous - I guess chimney climbing is an extreme example of this, where keeping moving makes it easier
doing lots of easy corners quickly is one way to get this - repeating corners on top rope or solo over and over again is another way
I've said it a lot before, but there is a lot of joy to be had from doing something over and over until you can do it with very little effort (and you get better at it)