I am enjoying my analog system, but what can I do to improve?

@rauliruegas , The combination of the head shell and the jack assembly will never be as light with less inertia as a fixed head. If there were no penalty for removable head shells then every one would have them. The best compromise I think is the Kuzma version. It still requires a heavy steel grub screw to lock the head shell in. SME moved away from removable head shells decades ago. Their best arms continue to have fixed shells and I know you like the SME V series as I do. It is a pity you can't get them any more without buying one of their tables. Hope they reverse that decision. 

@rauliruegas, that poster obviously has not heard them with the right amplifier.

@chungjh , I think your ears then are not used to higher volumes. Start at lower volumes and slowly add 5 dB every few minutes and you will get used to the volume. Sound Labs will make great bas down to 30 Hz or so before cancelation wipes the out. Your not adding subs for bass (unless you really want everything below 30 Hz). You are adding then to relieve the Sound Labs from having to make bass. The result is much less distortion. 

@mijostyn , talking to Roger West, the owner of Sound Labs, having subwoofer introduces discontinuity and also loss of clarity in bass.

You probably did not talk to Dr. West, as he is very hard of hearing if not actually deaf, and he does not talk on the phone to anyone. You may have exchanged emails with him. I have done so myself, and he is a very nice man and very tolerant of his crazy customers’ questions. As to your description of your issue, I don’t know what to tell you except that all of this stems from the small listening space. Also, I have found that the dynamic contrasts on an LP vary from one record to another. Some are much more dynamic than others. For example Reference recordings are always so dynamic that even in a large room I too have trouble settling on a position of the attenuator that gives me tolerable crescendos and audible diminuendos. It’s just something that comes with the territory of being an audiophile . Are you saying that this issue of dynamics occurs with every LP you play? If so, I would be surprised. I don’t think this is because you have too much amplifier power or that your speakers are too good. The speakers are just responding to the signal that is put into them. They don’t care how big or small the amplifier is. As to using a single ended tube amplifier with the speakers, that is very much not a good idea at all. I know of no such amplifier that can drive the sound labs satisfactorily , for one reason because they have a dip in impedance at mid frequencies which no SET amplifier could deal with very well. As I think you know, I have measured impedance versus frequency curves for my own 845 PX speakers, which supports what I am claiming. Your 545s will have an updated crossover and treble transformer compared to mine which partially ameliorates the problem (for any tube amp) but probably not completely. Not a problem for a Pass amplifier.

Lew, I find the dynamic range too high only on certain recordings. May be that is the way it should be for those recordings. BTW, I moved my seat as far as I can and it sounds much better. Much more natural and less “in your face.”