Does the normal rate of healing in Fallout 4 feel too fast? Does the Survival difficult rate feel too slow? I created this mod to provide a happy-medium of your choice. (Note this effects the rate of healing for all hp providing items, not just stimpaks)
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I found healing items to be overpowered in Fallout 4's normal difficulty levels (stimpaks, food, etc. all heal at the same rate in Very Easy, Easy, Normal, Hard, and Very Hard). They healed the player so fast simply buying a bunch of stimpaks and then charging into a raider den felt like an exploit. I was excited to hear healing was slower in Survival mode. However, I found this over compensated for the problem. In Survival mode, stimpaks/food/etc. heals at a rate of 10% that of normal mode. This makes stimpaks almost useless in combat.
So, this mod gives the player the option to adjust the rate of healing for stimpaks (and all other health providing items) on both the regular 5 difficulty levels (Very Easy, Easy, Normal, Hard, Very Hard), and Survival difficulty.
Personally, I recommend the 33p version, which puts healing at about 1/3rd the normal rate and 3X the Survival rate, but it is up to you.