Cartridge Loading- Low output M/C

I am using a humble Musical Surroundings Phonomena II. My daily driver is a Hana SL mounted on a Sumiko Premier MMT with continuous wiring to the RCAs; ergo shorter or lower capacitance cable is not an easy option. The integrated is a Primare I32 and for cartridge set-up I usually use Stax SRX MK 3 headphones, so only the I32's pre-amp is in the loop.

The internal impedance of the Hana is 30 Ohms. The Phonomena has a capacitive loading switch which I set to 200 pF, the lower option. Between 475 and 100,000 ohms I must confess that the differences I think I hear in the music are so small they may be imagined. Is this to be expected or should I run immediately to a good Otolarygologist?
What I do hear is that the hiss and ticks between tracks are less at 50 and 100 kOhms.  

@cather10 Thanks for the encouragement. I like the PII very much and think I will live with it at least until I upgrade my tonearm. I had been running the Hana at 475 Ohms and 56 dB until I read this thread this morning. Then I put on the cans and did some listening and am going to try 100K Ohms for a while and see what it's like to live with that. Now here's where I show my lack of expertise. I haven't been able to measure my phono cable's capacitance. My multimeter just reads 0.0 F, even though it has a uF range. Neither have I been able to track down the capacitance per foot of the Cardas 4x24 connecting the arm to the PII. 

@atmasphere , I am not sure of the implications of your statements as they regard my set-up, unless it's that the PII has a stable circuit. I hope.
Thanks for all the sharing!  

To get started with LOMCs I first bought a Schiit Mani, then upgraded to an Emotiva XPS-1 and now the Phonomena, so that is the extent of my experience with MC phono stages. I will say that in my opinion the MM section of my Nakamichi Receiver 2 beats them all with a Shure V15 RS.
An update on cable/phono stage capacitance: Musical Surroundings has a similar statement that MCs are not sensitive to capacitance in their owner's manual. To be sure, I have the dip switch set to the lowest setting. I've sent an inquiry to Cardas, so we'll se what they say, if anything. With a previous tonearm I used WireWorld Luna 7s. When I asked WW about the capacitance of the cable they said that they don't focus on capacitance; but engineer for the lowest inductance. I'm not sure if one can have a low inductance without a low capacitance. I'm just relating the story. The cables sound good.

@catcher10, Why 475 Ohms? Why not 1000?
BTW, I have no report on 100K yet. Too much new digital music to listen to at the moment. 

Hanna only states a lower limit of 400 Ohms and Denon a lower limit of 100 Ohms for the DL-301 mkII. No upper limits given. Yesterday I listened to Garcia's Run for the Roses, I have a white label copy that I haven't played much so it's in great shape. I compared 2000 Ohms to 100 kOms. The bass actually sounded more profound with more of the pluck featured at 100k. But that's just one LP so far.

Ok. Cardas responded that their Clear 4x24 is 16 pF/ft giving me 52.5 pF from the arm base to the PII. That most closely aligns with J. Carr’s first example at 32 pF. (Thanks @almarg , http://www.whatsbestforum.com/showthread.php?15077-Cartridge-Loading-A-Misnomer&p=258578&vie...)
That would suggest that an optimal load would be between 267 and 464 Ohms....EXCEPT for his footnote "However, the heavier the load on the cartridge, the worse the dynamics and resolution.

After further listening comparisons I am back at 475. I suppose I should just go back to listening for enjoyment rather than critically; because to tell the truth, I might feel that 1,000 Ohms is best tomorrow. I think my ears have been through too many years and front row concert seats to split hairs this fine.

Looking at Mr. Carr’s results, 660 Ohms is probably the best compromise for his Kleos. But what the hell. I don't have a Kleos and in reading the above referenced thread further, audiophiles with much more experience and knowledge than me (not to mention better hearing and listening skills) don’t agree. I Have 2 new MoFi LPs coming in the mail. I Think I’ll just relax with them.