So your maintenance treatment is every 4 days, then requires 14 more days of trearment where in your case maybe try every 2nd day. Are you doing straight DC or pulsed current?
Have you had hand sweating your entire life?
If not have you talked to your doctor about this cold hot condition? Something else may be going on within your body.
One suggestion besides doing your treatment every 2nd day would be to order some Antihydral. There is only one place online that sells this. It's a cream that's used for the feet. What I sometimes do is rub this cream throughout my hands 5 minutes before treatment, then I proceed as usual.
Another option is to heat up some snow so it melts and then run the snow cooled down snow water
through a portable Brita filter.
https://www.brita.com/water-pitchers/
I say snow, but rain water works also.
This will clean the water. Then add 1/2 snow or rain( not heated) water to the tap water and see if that helps.
Definitely start doing your treatment every 2nd day if possible.
Keep in mind that ionto doesn't work for everyone. Sad, but true.
I know it's hard to skim all the postings and using search doesn't always yield the results wanted, but the information is definitely here since I have been on this group for 7 years and a prior defunct active group for 5 years prior.
While you are waiting for the Antihydral to arrive you can substitute it with Certain Dri which is easy to obtain at most stores that sell antiperspirants. Get the rollon and follow the same procedure.
Ionto can be tricky and everyone can react differently.