Watch the Blues for Roy online guitar lesson by Jim Campilongo from Sonic Tele
The first thing we address is the murky, moody low chord voicings. Some of these may be new to you so take theme to internalize the sound and feel of the chords. Next, when working on the Pre-bending technique, try to avoid using too much vibrato (don't use vibrato on "auto pilot"). Concentrating on the Larry Carlton inspired pre-bending excercises (starting at 7:07 can do wonders for your playing.