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There is a branch, which apply the 2048 fix: https://github.com/steemit/steem/commits/20180917-increase-fork-buffer

but no official release yet.

Replaying 3 nodes took me 3-4 hours each.

What is your
cat /proc/cpuinfo
?
I would guess you have an i7 processor?
Those seem to run the replay way faster.

model : 79 model name : Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz stepping : 1 microcode : 0x1 cpu MHz : 2199.998 cache size : 16384 KB