After hearing the Min 10's for myself I echo a lot of your sentiments. But to be perfectly honest, you're expectations may have indeed been misplaced to a degree.
Jeff was kind enough to lend me a pair of Min 10's so I could experience them for myself. After listening to them for a few weeks I can unequivocally say they do an astonishing job for their size but they do suffer from a few deficiencies, none of which I didn't anticipate though.
There are certain immutable laws of physics that can't be overcome, regardless of how clever or cutting-edge the engineering behind something is (and the Min 10's are unique in that regard). One of those rules is that a 2.25" driver is just not going to provide midrange with much authority. That's like expecting an 8" subwoofer to give you chest-slamming, window rattling bass; it's simply not possible.
Small satellites are particularly finicky about crossovers and sub placement. With the former there's little you can do to mitigate the problem -- it needs to be set at 150Hz -- but the latter can almost always be rectified with careful placement. Jeff gave you some good suggestions regarding that already. When it comes to the Min speakers he's truly the expert, so you should reach out to him for assistance.
His concern associated to the sub is well founded. If you look at the specifications of the X300 and Min 10's that Cambridge pairs they appear to be a bad match, which is quite perplexing given how highly regarded their products generally are. I noticed that my ELA-3
subwoofer didn't particularly like being crossed over at 150Hz, even though that's well within it's specifications. There was no "hole" in the frequency response, but it did tend to excite a room mode and began to ring a little. My XTZ
, on the other hand, seemed far more comfortable with the higher crossover and the integration was very smooth. The point I'm trying to make is the subwoofer is extremely critical when it comes to small satellites, so it's not an area that should be overlooked.
Like the others have said, break-in is crucial. With so few hours on them I'd caution against doing any critical evaluating, in spite of how difficult that might be (and yes, I definitely understand how hard it is to refrain from that
). What I've found is they have incredible soundstage, and a level of detail that belies their diminutive proportions. I've also noticed a distinct lack of compression, even when the volume is increased to what should be considered above normal for something the size of a lemon. I was almost in constant amazement about what I heard, vis-a-vis their size. It didn't really seem possible.
Ultimately it will be your subject opinion that determines whether they'll work for you. Give them some time, and maybe try a different subwoofer location, but I don't think it would be in your best interest to give up on them just yet. They do have a tremendous number of good qualities.