Many of items will be sprite missing.
Try to use https://github.com/llchrisll/ROResourceCollection and put every country sprite together.
If you know something is missing, You can also help him to correct missing sprites.
Problem is he want to disable to spawn all monster on prt_fild for 45 minutes.
I don't know easiest ways to do it.
Only way I know is manually script to spawn monster.
Try use cap_value on item bonus or somewhere that calculate those bonuses.
---
Not sure this is correct way to fix but you can try
Go to \src\map\pc.cpp Line 3725
Add
sd->subrace[type2] = cap_value(sd->subrace[type2], 0, 90);
If some stats are too high it can be cause overload value then final result will start from 0 again.
Try lower your item bonus script. Is there something like ASPD +100%?