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I use my pinky because it feels more comfortable. I'm aware that Gary Moore would have probably played this sort of lick with fingers 1-3. But for this lick my thumb is over and not at the back of the neck. I'm left handed but play right handed and often use my pinky in preference to my 3rd finger as it results in a more comfortable hand position for me. Although I believe Gary Moore was left handed as well so that's not really a good reason.Btw. When I was learning the fast bit, I missed out the preceding couple of notes with the bend because that unnecessarily increased finger fatigue during constant repetition.
Thanks, helpful! I’ve been getting up to 80-90% speed but that’s getting very sloppy. It’s definitely a picking/coordination thing.