I don't think you're mad at all. Your current ps pension is integrated with the State pension and while good, isn't brilliant compared to pre92 ps pension.
If you make a pension contribution of the max allowed percentage of your offered salary for the next 10 years or so, you'll build up a nice little fund of 500k+ by age 65 as well as having a bigger disposable income in the meantime. (My crude back of envelope calculations.)
You'll still have your state pension plus your preserved ps pension. Not too shabby at all!