Actually, I do feel the lack of bass so the E5 is a great amp combo for me personally.. even then, the bass isn't as strong as the bass heavy gear - which is good. because now the bass doesn't drown out all the other details. are you using different tips for these? A lot of people tend to use the shure olive foam tips saying they're the best combo. I'm pretty satisfied with the smaller biflange tips. but I wear them differently.. I push it all the way back to get the drivers closer to my ear.. you might wanna try that if you're using the same tips :)
Oh, wait a minute. . .when you say "smaller biglange tips", are you referring to the shure olive foam tips? Sorry, if I misunderstood you. But I thought you meant the small ones included with the RE0s'. . .sorry if I misunderstood you. But the ones that came with the RE0's are what I'm using though.
Maybe I should try the Shures?