IMHO the 5x rates are good

It will proabably bring some ppl/clans that are taking L2 more seriously (no offense) to this server (cause the 30x is more like for fun).
The drop rates would be nice like this:
Chance:5x
Amount:1-2x (let's keep spoils in the game

)
Adena/Seal Stones 3x
Fulldrop/recipes:5x chance
And Spoil(as Sluki said):
chance x1, amount x5 for mats, keys
chance x5 amount x1 for rcps, enchants etc
Quest rates:
5x amount XP/SP/adena(except for DE 15 quest)
Varka/Ketra: 100% chance
Suppliers of reagents: 100% chance, 3x amount
IT/FoG...:2x amount
And I would also prefer the no dual-boxing or 1dual-box per PC cause honestly multi-boxing is ruining the game, especially on low-rate servers because players are not forced to make parties. So everyone solo with his army of pets.
I know it's really hard to watch for multi-boxes for GM cause it really time consuming but in the end it will proabably help the game/economy/clans(and in-clan relationships) to have no dual-box or just 1.
But I trust Gm's/Admins will make it a good server ofc