I don’t think my grip strength ever really increased when I started working up with double overhand. The poundages just aren’t significant enough to matter, and if you’re stretching the limits of what you can double overhand the real goal of training a deadlift will suffer dramatically, unless you’re some giant-pawed freak.
Captains of crush and training bjj in a gi did much more to help my grip.
Same here. I’ve only had an issue with grip during one training cycle I did. Fixed it by doing double overhand Barbell shrugs for super high reps, adding 20 or so pounds a week for 8-12 weeks. Something about the bar pulling down every rep trying to open your hands seemed to help a ton.