2 - apply a little eq ...it won't hurt so much if you use it wisely
3 - try if you could the white and brown filters ...i guess their removal is easier than the stock ones
4 -BTW . I guess it is time for a DAC/amp option .... You will be happy with the C5D the best transparency and neutrality in its price ... Digital volume control for better balance ... And the more important for you the best bass boost implemented in an amp with 2 steps and recommended to me by a lot of headfirs for my shures ...
Wait the westone tips ... And have your time with all that stuff ... Then you can decide if you want to go with the dac/amp option