You need to go for the low hanging fruit. 280/50 is less than federal minimum wage.
You can argue it's not as presented, and that's great and you should, but the proof and credibility determinations are tricky. With a less than minimum wage job, you can prove it with paystubs from the company (lots of credibility), timesheets or attendance logs (lots of credibility), and you only need make a token effort to ask for minimum wage. That it is a "good cause" quit.
Also when you have low wages, you should try to make a case that the 'time, distance, or cost" was out of line for the amount of money received.
This is an example of what can happen when you go for the more complex reason to get UI:
EDD Debit Card = Benefit Approval?. As you can see from that thread, we gave great suggestions. At the hearing when the employer stipulated the wages had fallen, the claimant didn't feel it necessary any longer to present the pay stubs and is attempting to go to the board of review to make that case, but it's going to be a much harder sell because the pay stubs could have been presented at the first hearing, and might have made all the difference. The ALJ applied a pretty hash version of "adjusting a grievance," and that's why you want to go from easy to hard: Less than minimum wage, "time, distance, cost," and then not as promised.
You never know what reason the Deputy or ALJ will accept, so you go for all applicable reasons that you can make a case for. Because once the record is established, you probably won't get a do over.