Thank you feiao for your note, now almost everything is clear. Only one point, when you say "new batch" ¿you mean the one with the "Olympus" text in the box and the golden connectors? ¿or just having the golden connectors is enough for being a new batch with the improved delay (0.1s)?.
I just contacted the Spanish distributors, and the E10 they supply has golden connectors but not the "Olympus" label in the box. I'm rather confused about this.
The delay time bug is fixed when we change the RCA to golden RCA connectors.