Question regarding transformer wiring for 230v mains

[cypherize]

I'm currently in the process of building a crack and am at the step requiring me to wire up the transformer.
 
I measured my mains voltage across the IEC and recorded 234v. The manual for the crack offers multiple wiring methods for the transformer to accommodate various mains voltages. However, the closest appropriate voltage ranges for my mains supply is either 225v-235v or 235v-245v. Which of these ranges should I pick, and what issues may I run into, if any, with the selection?
 
I only ask since my mains voltage is so close to the max and min of each given range and I don't know which one to go for. The mains supply is supposed to carry 230v but it is rather inconsistent.

[Paul Birkeland]

225-235V would be most appropriate.  Your voltage is 2% over the nominal 230V and 2.5% below the nominal 240V, so you are slightly better off with the 225-235V configuration.

[cypherize]

Awesome. Thanks, Paul. I'll go ahead and wire it for 230v