I use a Seduction. I've used Beyer mic transformers on 1:15 and I have some Sowter 1:10s now. Used a 103 for years, have an SPU now. Never had an Eros in my home system.
These carts require proper care & feeding. I'd say the arm influences more than the stepup... Sounds like it's been some time between attempts, what all has changed? Just the phono stage, or is there more to the story?
I'm in-between at the moment. Over time, I sold my BH gear (other than the Eros) and got a Quicksilver Line Preamplifier, an AVA Synergy 300 and a pair of Salk Songtowers. The current table is new to me: a TD-124.
The unsatisfactory results with the Eros, the A23 SUT and the 103 were on the 124 with an SME 3009 S2 unimproved arm with heavy counterweight and lateral weight. I could have screwed up the setup of that arm for the 103.
I'm waiting for delivery of a new 'arm for the 124 next week: a Pete Riggle Universal Woody, and plan to install the 103 on the Woody. I should be able to accurately dial in the 103 on that (super adjustable) arm.
I picked up a used Musical Fidelity X-LPS 3 phono preamp for a good price along the way, but don't have a clue whether that will mate with a SUT & the 103 the way a low gain tube unit might.
"Too soon old;
Too late schmart"
The late Mr. Fox, Fox's Deli, Rochester, NY
Mike P.