That's my avg aha already gotten 2 from this event and I'm at 4000, with probability you have about 50% chance to get a silver every 4 goes. event gives you 12 goes so if you lucky 3 silvers
2 of your 6 rolls were silver? That is well above average.
The spoiler below contains my armies.
Advice is always welcome.
Below that is a link to my army thread with even more details!