What is the total budget? What have your geeky developers developed and delivered? How much does that contribute to the revenue?
Paying a premium for niche or specialized talent depends on how much it will take for you to hire a replacement or pay a retainer if the employee is being poached by your competitor.
Looking forward to hearing from you. Matching industry standards will set in once you have a clear view of how much you would or should pay out.
Regards