Lets try again. According to TM your amplifier should have no problems. I don't know your speakers but modern Kef's are neutrally balanced compared to some other manufacturers, hence a lot of comments of 'no scale' (they have plenty but bass is tightly delineated and fast) so there may be an issue there. I don't think the way your cables are routed is either a problem or especially advantageous. If I understand correctly you are driving bi-wireable speakers with two runs from the same amplifier speaker terminals. I'm sure the Krell has no problem with that but personally I would just use a good, purpose made pair of jumper leads and one run to the amplifier. Before you say you are going to bi-amp or use mono blocks (because you have the money) this will most likely extend the bass but at the same tighten it. So you may feel you have even less.
Your cdp is passe ok. I know they still have a die hard following but it really has no place in a system this quality and whilst it was a great product in its day it sounds (to me at least) bloated, veiled and in-precise. Its called a lot jiiter my friend. By the the way I used to have the sig version a long long time ago. You could change that to a good modern player such as the higher range cyrus, Arcam, CA, Quad, Lyngdorf or aim even higher but again one of the improvements you'll usually find is better (and with it tighter) bass. What that does is subjectively tightening up lower frequencies which in turn, and once again, can come over as less bass where in effect its just more acurate.
Cables ... I wont go there.
Room; After all those posts and spending money I would hope you've tried every conceivable position and exhausted all possibilities.
That leaves us with a sub. I'm pretty sure we've mentioned that before to you. This will give you the flexibility of moving it around for best positioning and the necessary controls to integrate and match up to your main speakers whose basic tonality I would assume you like because you have'nt mentioned changing them. I am now totally convinced of using a well matched sub for audio. It has multiple benefits and can both tighten up loose bass or add a solid foundation (even bloom if that floats your boat) to systems which are short changed in that respect. There are further benefits through the mid's and it can even balance a wayward treble and bring it in line subjectively. You're obviously a bass head so make sure its nicely big, heavy and with a driver the size of an umbrella. If your dog or cat can enter through the port and feel at home inside you've probably found your size.
Did I forget anything?