The current design seems pretty good. The generation rate is higher and there are fewer fall deaths. Overall the efficiency of this grinder is nearly as good as the one from SG5. Can we capture this design if we are going to have to rebuild each month?
I see some small issues collecting XP balls with the two block wide design, sometimes I have to walk around to collect them, but if this is what is needed to get the higher throughput that is fine. Also I got a half heart damage once at one of the corners, but only once so far, not a big deal.