His advice is sound.
Many of us will give you advise for a reason and its not to sugar coat it for your liking.
The truth is easier given blunt.
How are you measuring your temperatures?
If you changed this much stuff you are interrupting your snakes normal activities and adding even more stress during an already stressful time.
FYI, did you notice an iridescent shimmer on the water when soaking your snake? That is an oil they produce to assist in the shed process, if you wash it away it makes things harder.