The short version:
It seems that Patreon's new policy is to charge a constant $0.35 service fee instead of a purely percentage based service fee. This is bad news for people who pledge 1$.
What I've done as a solution is to add an additional "$1" tier which you can now see on the right sidebar, which is basically charging $3 once instead of 3 times X $1. If you switch from the existing tier to this new tier and put a hard cap on your end so that you'll only be charged once per month, it will end up being much cheaper for you.
These are the new rates:
Pledge $1.00 to pay $1.38, Patreon's cut is 27.5%
Pledge $1.60 to pay $2.00, Patreon's cut is 20.0%
Pledge $2.57 to pay $3.00, Patreon's cut is 14.3%
Pledge $3.54 to pay $4.00, Patreon's cut is 11.5%
Pledge $4.51 to pay $5.00, Patreon's cut is 9.8%
Pledge $9.37 to pay $10.00, Patreon's cut is 6.3%