This is the very thing that makes the life of an audiophile a very tricky one. It so much depends on the sum of all the parts. A $3000 power cable can make your system sound horrible in one place but move it to another component and it can be bigger than a component change. A new digital cable can bring your system to a level you never thought it could reach. The flavor of the month power conditioner could make your SOTA speakers sound like a car stereo. A power strip you know little about but grabbed on a whim could transform a lifeless sounding room to the most natural, organic music reproduction you have ever heard....but change the cable feeding it and it sounds as if someone is holding pillows over your tweeters. I think DACS are just another piece to a very complicated puzzle we are trying to assemble and in most cases, none of the pieces were really meant to go together.
So I have no real answer to your question but certainly have been there. There are really several things you can do if you want to improve your systems performance, a dac could do it, even that one. maybe a different digital or power cable? Maybe moving up to the Transporter or any of the many many dacs around in that range? Maybe different ic or speaker cables? They will all do something but you will be the only ears to know if it's an improvement or not. Fun, isn't it??!!