[fjtorres]

Sorry your PB is hurting.
But alas, the airport screeners are innocent; the only risk to ereaders from them is physical damage. The recent reports in the media about xray screening hurting eink screen is flawed in dozens of ways and meaningless.
And your reader's sympthoms are the same aflicting my mother's K2, which has *never* gone through an airport or taken a physical hit. She does read at large print sizes and read a *lot* so the reader has gone through way more page turns than your typical reader.
It sounds like you're a heavy reader, too, so both readers may simply be showing signs of usage-based screen deterioration. Surprisingly early, compared to other screen technologies, but it *is* a new-ish tech still.

Might be worth a GENERAL DISCUSSION post to see if other heavily-used early eink readers are developing the streaks.

Hope you find something you like. The PB611 is (unoficially) rated at 175g and the PB360+ (180g) are about as close as you'll get to the PB301 weight-class these days.

I would suggest you take a look (if you haven't yet) at the Nook STR (212g) and Sony PRS-T1 (168g). They are both fairly light, compact, and android-based. And they bear the latest "Pearl" eink screens. Being Android-based, both can be easily hacked to open them up to the installation of generic Android tablet apps, including a bunch of reader apps like FBreader and Coolreader that renders them comparable to the Pocketbook line. You don't get *all* the benefits of a Pocketbook reader but you *do* get an eink reader that can access ebooks in pretty much any format supported by the PB.