Reason is in the logger. Please read troubleshooting section
How would you suggest doing the reward potential, in a repeatable way? The only way to hit exact % would be to search for specific enemies, which may or may not be on the shortest path. Going in and out of doors until you get the correct enemy would be an option, but I doubt it would be more time efficient.
The current prayer threshold uses this formula:
nextDrainAmount = 8 + {killed brother count}
prayerThreshold = 3 + (nextDrainAmount ONLY IF next drain is 4 seconds or less away; otherwise 0)
I don't think it's overly safe, although you are correct that it does not account for enemy remaining health. Accounting for that would introduce a risk though, as there's always a chance you'll be hitting 0's for the next 5 minutes.
I don't have a zulrah script, but will start a trial for you. Purchase with 07 gold can be done thru the Vouchers subsection of the marketplace
Sure