I checked, and you definitely were eligible for at least the last 2 shuffles. (I didn't check further back.)
I'm pretty sure I was eligible 
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It is very unlucky: looks like about a 0.4% chance to get skipped 4 months in a row.
That's lower than expected, so I checked: (35/135)*(34/134)*(23/123)*(33/133)=0.3% chance indeed!Quoting the great Rasheed Wallace... "Ball don't lie."
https://www.youtube.com/watch?v=Y4i45kNO-cE
Try cleaning up your trust network a little bit and stop supporting liars, trust abusers, and users you've had no financial interaction with. Maybe your trust network karma will change a little bit. Not to mention, you shouldn't even care. It's not like you've had a lot of real interactions here that add value to the network at all. Looking at your left trust it looks like you only bully wannabe scammers who likely had no chance to ever scam a satoshi, which is just educating them on how to better fleece users here in the future.