Careful Matt, this is not a path you want to go down!
All systems will add colour.
Sit back, enjoy it for what you have. If anything, there is probably no such thing as getting the "real" thing from your kit. You either need to be in the venue where the original recording was made, or can play around with the master tapes in the production studio.
Anything else is at best a decent approximation.
Accept the colouration and if not, search on some of your posts over the last couple of years, or look at your spare kit selection and have a bit of a think!
Joking aside, it's all about compromise and you need to do less of that with a lot of entry level kit now than we probably used to twenty years ago. Bear in mind a lot of your recordings will have some added bits and pieces thrown in during production, so even the best classical performances in terms of recordings won't be a faithful reproduction; close but no cigar if you will.
So I hear your frustration, but your choice is either to either accept your lot and handle the compromise, keep switching your existing collection, or continue or the ultimately unsatisfying treadmill of box swapping. Only you can decide which is right. As ever, it's down to knowing the sound you want.