I'm working on OHP 32.5lb dumbbells and pressing them overhead for sets of five so I think 30lbs is totally reasonable for that, though it may take you awhile -- I've been lifting weights for almost two years now and apparently have better than average upper body strength for a woman. (Sets of ten are around the 25lb range.)
I'm doing these side/front lat raises (raise the weights out to the side to shoulder height, bring them to the front, raise them over your head, bring them down to shoulder height in the front, swing them out to the sides, bring them down. That's one rep.) and can do more than ten reps with 5lbs but can't do ten reps with 8.5, which is the smallest increment I can do up from five.) So very different weights for different things -- lat raises use small muscles that don't get used as much so they tend to be harder.
So I second the suggestion to use different weights for the different exercises and if your goals is strength, go heavier and low rep. 8-12 is a good muscle building range if you're eating enough to build muscle -- more than that is good for endurance and 3-5 is good for strength, though I've been told that OHP response well to high rep volume work when you get stuck, probably because it can use the extra muscle you build. Add weight when ever you can complete all of your reps with good form on all of your sets, and 3-5 sets is a good number. Three is pretty standard; if you want more volume or practice, doing extra sets is also good.
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I'm doing these side/front lat raises (raise the weights out to the side to shoulder height, bring them to the front, raise them over your head, bring them down to shoulder height in the front, swing them out to the sides, bring them down. That's one rep.) and can do more than ten reps with 5lbs but can't do ten reps with 8.5, which is the smallest increment I can do up from five.) So very different weights for different things -- lat raises use small muscles that don't get used as much so they tend to be harder.
So I second the suggestion to use different weights for the different exercises and if your goals is strength, go heavier and low rep. 8-12 is a good muscle building range if you're eating enough to build muscle -- more than that is good for endurance and 3-5 is good for strength, though I've been told that OHP response well to high rep volume work when you get stuck, probably because it can use the extra muscle you build. Add weight when ever you can complete all of your reps with good form on all of your sets, and 3-5 sets is a good number. Three is pretty standard; if you want more volume or practice, doing extra sets is also good.