Dear @sksos1 : Other that the LOMC cartridges are not sensible to load changes and with all respect I can't understand that you want to use a SUT when you own an active high gain phonolinepreamp. Just my curiosity.
Any cartridge will sound and performs with higher quality levels in that phonolinepreamp than in any SUT at any price where the best that can does the SUT the BEST is to degrade the quality sensible cartridge signal. So you will listen a degraded quality sound through any SUT.
In the other side as @lewm posted you are really better that a bat hwn can hear differences between between a difference of only 36 ohms whe the cartridge is insensible to changes on load impedance. Makes sense to you what you are listen it? or maybe is what you just want to hear. Obviously that's what you like and is ok for me or any one else.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.