The 'Sec' part of that job title is just not going to move the needle when it comes to salary. Companies talk a good game when it comes to devops security and 'shifting left' but few, if any, will actually pay for it up front and instead will just use it as an additional feature when selecting among various candidates for open roles. Just look for any devops engineer data and hope that by playing up security experience you might be able to bump your ask 5-10%.