The deads may be your problem. In Starting Strength, Mark Rippetoe advises that deadlifts are the single hardest lift to recover from. For beginner/intermediate lifters, 1 set of 5reps (with proper intensity) is enough to drive progress (meaning more weight on the bar next workout). If your doing 3 heavy sets with supplementary hamstring exercises one day and another day more hamstring exercises but slightly less weight and more volume, it may be enough to trigger that DOMS you're talking about.
Some ideas which MAY or may not help: always warm up properly. Get on the row machine, stationary etc for a few min and do just enough work (low intensity) to get your heart rate up for about 5min. DO NOT do static stretching BEFORE lifting (it can do more harm than good). Dynamic/active stretching is fine start with body weight squats than (load up 135lbs or some light weight) do a couple reps of DEEEP squats to activate hamstrings get them stretched and warmed up, when starting deads start at light weights and pyramid up to your work sets (you may even want to use the pyramiding scheme to add to your volume while peaking intensity on one set (if your max is 315x5 maybe do 135x8, 175x8, 210x6, 245x3, 275x 2, 315x5. So use the one max set as your intensity to drive progression and the pyramiding scheme to alter volume while lowering intensity for everything but the one top set. At the end of the workout you can add more Dynamic stretching also do some static stretching, I've never been a fan of hamstring curls so maybe try switching that out with hyperextensions, reverse hypers, glute ham raises etc. you may be completely opposite and need lightly higher volume or intensity to bypass DOMS try each way and see what helps. I'll also look around if I can find my copy of the book and see what Rippetoe recommends for hamstring DOMS.
My training is geared more towards strength so it may not apply to you as well as it would to me but i have two basic full body workouts that i do 3x/wk tues, thurs, sat
A) squats 3x5reps
Bench press 3x5
Power cleans 5x3 rep
B) squats 3x5
Overhead press 3x5
Deadlifts 1x5 reps (pyramiding up to that top set with warmups and reduced intensity and volume)
^^^to these I add accessory and supplemental lifts for lagging body parts and to address weaknesses in each main compound lift. So I'll add dips and CG bench to help tris and drive bench press progression, I'll do high jumps/weighted platform jumps to help with explosiveness and drive squat/deadlift progressions, ill do ab work and hyperextensions or SLDL to help core muscles with all lifts, explosiveness on my power cleans has helped translate to squats and deads, working on good hip drive also has helped all lifts.
I go A B A B A B fashion so I always squat 3x/wk and some weeks bench and power clean twice other weeks I deadlift and overhead press twice. I go 5lbs of linear progression every time i do a lift so 5lbs more than I did previous workout. It can be tough sustaining such progression but calories surplus, proper recovery, and intensity/volume accounted for helps sustain it for me. I doubt it's a form issue but its never a bad idea to post up a form check. I would work on good stretching, good warmups and start manipulating training variables (intensity, volume, exercise selection) one by one to see which helps you out the most.
