Cutting dose is probably the safest thing to do if that is possible.
After that low dose benzos do a really good job of addressing the 3 most common issues with amps - heart rate, blood pressure, and body temp. A low dose would probably help, and like said above, if it is low enough it wont stomp on the stimulant effects you want that much but will help with the other side effects decently.
In case you are interested benzodiazepines are the first line drug that hospitals (at least in the US) will give to treat amphetamine overdoses in most cases, so are very appropriate to recommend in this use case since they are the medical standard.