To be fair, I don’t mean 13 modules – I’m counting E370 as four, Hertz Donut + Kermit + Double Helix as two each, and Plaits, Tides and Warps. This is in 9U 84HP + 6U 104HP.
The E370 was sent to me by Paul Schreiber for beta testing, because he appreciated my efforts testing the E352. I thought it was overkill for me, but was I going to say no? 
My current thinking for downsizing is I’ll have the ER-301, E370, and 2x Rings for sound sources and keep Tides for modulation duties; I might hang onto Plaits too. And I’ll do a bit of consolidation among my other modules as well to tidy it all up.