Lyra Titan i with a Manley Steelhead....settings??

Just got the Titan-i after trading in my Helikon to Hollywood Sound in Hollywood, Fla. Sounds great!

Question...what settings/configuration of the Manley Steelhead pre-amp would be optimum?

I'm running it through the MM inputs now (on the advice of the previous owner who said this avoided step-up transformer....etc and was purer sound). But, the Titan is an MC cartridge... so?

Also, regarding gain....what are the trade-offs? I've got the gain on the Manley all the way up on the 65 setting, and there's NO problem with volume when running everything into the McIntosh C-100 preamp. It just gets quieter, maybe less 'dynamic' on the lower gain settings....but, why would anyone want less gain?

Then, there's all those Load capacitances and Z's to choose from....... Can't say I hear any differences twisting the knobs. Whassupwiddat?

Any help//advices welcomed.

Thanks, in advance.