The SEP calculation is
25% of your W2 income, which would put it at $8,500 at your current salary. Raising your salary means paying more SE taxes to defer income taxes. You'll have to do the calculation yourself to figure out if it's worth it.
Remember that any amount your business pays for health insurance counts as salary for single-employee S-corps, since it goes into box 1 on your W2 and then you deduct it on page 1 of form 1040. So for example, if your business pays $10k in health insurance premiums for you for the year, your salary is actually $44k and your max SEP contribution is $11k.
Everyone's business is different, so you'll have to figure out what level of working capital works for you. Personally I'm backing off from retirement contributions for the year because I only have two months of buffer in the business and I want to extend it to six, but I don't have a two year contract to depend on.
Also don't forget that the money you put into an SEP isn't gone for decades. If you absolutely need the cash you can pull it back out, but you'll pay your marginal income tax rate plus the 10% penalty.
edit to add: The IRS wants to see you pay yourself a "reasonable" salary. You didn't say what your line of work is, but would someone also in that line of work consider $34k a reasonable salary for your level of experience? It's 43% of your annualized contract which may put it on the low side. Of course right now the likelihood of an audit is super low with your configuration since the IRS is focused mostly on S-corps that pay no salary and/or take losses, but make sure you're at least taking a defensible position. In my business I pay myself roughly the same percentage as salary, but I defend it by saying it's the same amount (to the penny) that my previous full time W2 job was paying.