Make sure you take your spigot on bottling bucket, auto siphon and bottling wand completely apart when sanitizing. A lot of people do not realize that spigots and bottling wands come apart (plastic ones anyway) - they do. These are key places where bad things can hide.
Get a smaller diameter tube that fits snug with auto siphon and bottling wand.
+1 to boiling priming sugar in some water and adding as a "syrup".
+1 in regard to sanitizing of bottles and caps.
Make sure everything is "clean" before it is "sanitized."
Kegged/Serving: Dortmunder, Bo-Pils, Nugget Nectar Clone, Citra IPA, One Hearted Ale, Heady Topper Junior, Scottish 70, British Dark Mild
Bottled: Barley Wine, Sour Belgian Golden on Cherries
Primary: Ordinary Bitter, Bourbon Barrel Imperial Porter
Secondary: Bo-Pils, Sour Cherry Stout,
Future Brews: German Pilsner, Dortmunder, Porter, APA, IPA, British Dark Mild, More...... More....... Beer.......