cartridge loading ?

the cartridge is a koetsu onyx. i've rewired my tonearm w/ cardas 33 ga Cu. i'm experimenting w/ phono interconnect using the sound of guitars i know or own as reference. currently i'm closest w/ modern audio design "pearl" altho i'm still switching between the mad, some purist audio design phono cable & some homemade cable w/ extruded 5 9s silver & eichman plugs. the phonostage is a retubed mar modded melos ps 1 gold.
altho i've read that koetsu' are supposed to run into 100 ohm loads, i seem to prefer a 390 ohm load i have avail. since there is no " factory" documentation on koetsus and there are varying opinions on the net, how do you determine 2.5x the impedance level of the coils?
i'm also confused about impedance. it looks to me as if my controls select resistors of increasing value and i've encountered threads that refer to " resistive" loading and i've assumed that i was selecting an "obstruction" to the flow of current. does a resistor generate a frequency specific "impedance" because the coils oscillate around a null point? is that all it takes to move from resistance to impedance?
as i look at this it occurs to me that perhaps i need a primer in electricity. is there a concise reference i should know before sending out threads like this?
thanks for your patience'
jon

duh.
out w/ flu a few days but as i try to wade thru this, i fear i may have tried to return too soon.
i think my koetsu has an output of 0.6mv. i believe my melos phonostage offers 54 and 78 db of gain, i use the lower output since even that provides a higher level than my cd player. i am clueless about the capacitance of my various "phono" cables, altho i may have some documentation on the purist; they are all 1m. length.
i think i'm finally clear on the importance of the capacitance of the phono cable & preamp, altho i'm not yet clear on how to solve it, but i'm still struggling w/ the resistance/impedance issue: primarily i see now because of ignorance of fundamentals. i've got the electrons moving d/t the coil over magnet assembly. does increasing the value of a resistor to ground force more of those electrons to the tube grid? is this the formalism for increasing the load on the cartridge?
thanks,
jon

my koetsu is an old onyx( 5 yrs) w/ an output of 0.6 mv. the 0.2mv output is for the new platinum coils.
altho it seems counterintuitive to me that increased resistance should lead to increased output, i guess that's why they call it ohm's law instead of ohm's clever idea or the like. since it appears my taste (&/or hearing loss) lead me to a peaky output preference (altho it seems to me brighter & "airier"), am i doing anything destructive to the suspension of my cartridge running it into 390 ohms?
i should add how much i appreciate this forum. i can't guess how many years it would take me to make any sense of this material without the expert & experienced help available here.
thanks,
jon