This is kinda offtopic and should be moved to random chat or minecraft. But gold tools are more likely to get it and lvl 21 is the minimum needed.
Unless you want silk touch on shears, it would be best to enchant the tool you want silk touch on instead of using books. The chance of getting silk touch on a book at level 30 is less than 1 in 80.
He wants to know how to get silktouch easily in FACTIONS so, no, this is in the right section, don't move it. Also, enchant lv 30 books. That's my tip.
Just keep on enchating your item over and over lvl 30 and you will get it. It's worked for me many times c:
Silk touch is very easy to get in 1.8... just use a dial enchantment table to check all possible chances to get silk touch 1
Turns out I was incorrect, the chance of getting Silk Touch on a book is 1.1% from level 16-30. So enchant at level 16.