Am I reading that correctly - you got a 25 at AMPS? Did you retest right away at that point? Did you retest again at +1, or just take the one "+1" reading?
If you truly have a reading like 25 (ie, it wasn't a bad test strip or a bad reading from not enough or too much blood on the strip), you don't want to be feeding low carb food like EVO...you want to break out high carb food and/or karo. I can't stress how dangerous a number like 25 is, and you need to get Skinny up and over 50 as quickly as possible - low carb food just isn't going to cut it. With a true 25, you are bordering on seizures, brain damage, and death. Often times, a trip to the vet for a dextrose drip is required when a cat hits numbers like this.
With that said, I wonder if one or both of those numbers are not truly accurate readings. Aside from the fact that 25 is a terrifying number, usually when a cat bounces, they don't jump over 360 points in the course of an hour.
Honestly, I'm not 100% what to tell you to do here. Can you retest and post again? I'd like to see another number to see if we can see a trend.
Did you shoot anything at all? If that 25 was a real number then yes, you would absolutely reduce, regardless of how high the bounce is - Lantus dosing is based on the nadir, not on the preshot value. If that 25 was not a bad strip or bad reading, I would probably take an extra big reduction again - to .5u maybe. At the same time, if that 25 is a an accurate reading, I'm very hesitant to suggest shooting anything at all if you're not able to monitor.