I can only speak for here but in the EU, you have to have your soap assessed pre sale - part of the assessment is to tell you how much FO or EO you can put in your soaps - my assessment says FO's can be added up to 2%. If you can work out 2% of your weight, then just weigh the FO out (little jewellers scales are great for tiny amounts and you can get them on ebay very cheaply if you don't have some already) to that amount. Hubby said my soaps were under scented too and I tended to agree with him - since having been given the allowed %, it's made life a lot more easy!
As to dulling the soap, not really sure what you mean - some may discolour it over time, the famous one being vanilla. If you use ones that are, say quite a yellow colour, it can discolour your clear base a little but not hugely. Some FO's are, of course, stronger than other so you could kick it back to 1.5% or something if you wanted, in that case.
HTH.
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