I've played SP for prob ~3 years (sometimes hardcore sometimes on and off). I know how things go I hope and am pretty experienced. I was the 7th person to achieve the moon rank in the english version I believe and currently have all my cards (earth) at lvl 7 with decent skills. Once again, if you have questions, post and I'll answer them if no one else can. Good gaming.
I only know about things dealing with in-game stuff. Start-ups and things dealing with outside interference, I have no idea how to help.
What is your best way of collecting elements? Soloing the Dragon? >.<;
When I'm bored I try to solo Forest Quest 4. Chests and Cycs.
When I'm really playing I go to Big Match Survival. I go into an 8 player room and use Warren. I have a lvl 7 Earth Ax atm with a bounce up skill. Just on in the corner and spam your ax and when you get crit, you'll take out 5-6 guys in one swing. Or when you see someone in the corner, hit the players/CPUs into the same corner and when they bounce out hit them again and they should die.
I forgot my other method too. When (or if) I have an SS or a Character/Master Card, I solo Dungeon Quest 4 with Prem Hazel.
And to answer your other question, that was during the event of x3 code/ele gain.