The base Zero SR has the same price as the Empulse E1. I'm sure that the Zero will blow it away. I really regret getting the E1. Unfortunately I didn't find out about the slower motor until the same week it shipped (after waiting 2.5 years). Brammo should show the E1 some love too.
Very sorry you feel this way. A couple of points to (hopefully) lift your spirits:
1. You'd need to buy 1 or 2 additional chargers to match the charging power that comes standard on your Empulse base model. So... your bike is actually $600-1200 cheaper than the SR.
2. You've got a bike that still has better suspension, brakes, tires, and chassis than the top of the line Zero. Even the Zero owner had to concede that one in his review.
3. You've been riding a great bike for awhile now, the new bikes are not hugely improved to the point of making your bike obsolete or even close to it, and you are well positioned to get a new bike when the next "big step" occurs.
4. Many riders prefer the power delivery of the E1 versus the R as it doesn't have the huge torque that can make the bike feel "abrupt" on throttle. Spec sheet performance is not everything. Most racers would prefer a bike with a great handling chassis and smooth power delivery vs. a bike that's a "handful" with a lot of power and a chassis that struggles to keep up...
5. Get out and ride if you can. Riding any motorcycle is scientifically proven to make you feel better!