The first thing I would try is to avoid the inc call, which is what bliako does in 11114118.

It is probably worth instrumenting the code block with print statements to see what happens in this code under normal circumstances for a simplified script with nested evals. Or you could use the debugger if you are familiar with it or have access to one through an IDE.

(Edit 20201303 - use code, not para, tags for "inc".)