Hey chris, My goals are simply to get better at jiujitsu. I could stand to lose fat and gain muscle but both those goals are secondary.
I can only do around 1-5 a set and after a few sets that drops and my form completely goes. I think this is probably due to carrying a few pounds (over 20% bodyfat)
Thanks for the recommendation on grip training, I shall do it on deadlift day.
I know I'm going to get flak for this, but do a few sets of chins or pullups. When your form starts to get really bad, move on to pulldowns. Get the rest of your 75 reps there, even if you use only 50 pounds. Next time, add 5 or 10 pounds to the stack. Keep adding weight just about each time, even if you have to throw a 2.5 dumbbell on the weight stack. There is no way, at the level you are doing pullups now, that you will crank out 75 reps, no matter how many sets you do. Technically, you could probably do 75 sets of 1 rep, but you will tweak your elbows or shoulders. Until you get good at them, you will just injure yourself.
Keep adding weight to the pulldowns each time, which is actually not hard. Of course, you want to keep adding reps to your pullups and only make up the difference with the machine. Conversely, you could also utilize an assisted pullup machine to mimic the actual movement more closely or you could use bands.
To a certain extent, pullups are directly related to your body weight, muscular or fat. Just keep plugging away and eventually, you will get there. As a nice bonus, you will hit new pullups PR's just about weekly, even if it's one rep.
For the record, I've been doing 5/3/1 for a while now and I love it. I've hit every number in almost every workout so far. All three big lifts are PRs for me and I've have never done 75 pullups in a workout in my life. However, I do them twice a week in one form or another