Honestly whenever I hit the 230-235 mark, I had a HELL of a time breaking past that....I think that was my first "set-point" so to speak...like my body said, nope, no more...
What I did was increase my carbs and fats mostly, while my protein was increased very slightly. I also added in additional sloppy meals like pizza, breads, etc. in order to try and shock myself to grow.
I kept a close eye on my BF with caliper readings and tape measurements...I could really get a feel as to how my body was reacting to the different (in this case, crappy food) foods and massive increase in cals..if I were you and are still consuming 600+ carbs, then I would just try increasing your fat intake in your shakes.....use some kind of oil (preferrably flax, etc.) This will give you an easier way to increase cals w/o much chewing...lol.
Other than that, I would switch up my routine every other week. High reps for two, then low HEAVY lbs. for two. And actually trained less than I was previously....like only 2-3 days/week.
I think you'll get past 230 bro, just keep pluggin' away with diet, and make sure to minimize any overlap with your training split as much as possible. I think that as you get bigger, it will be easier to overtrain due to maxing out genetic limits...