My ICS did something similar at our season opener. Was shooting down after only a few feet out of the barrel, I messed with the hop up and it started hooking up and to the right. After that it had a loss of over 100 fps and misfeeds. Turned out to all be due to a rip in the hopup rubber.
I know you replaced the rubber but I'd just double check for a tear. Mine was tiny but more than enough to mess things up.
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