North Skybound Watch:
-Resurrected bandits
On first arrival you will fight the bandits together, instead of finding them dead. Afterwards Zarlak will stay at North Skybound Watch.

Peak's Shade Tower:
On your first arrival S'vashni can be spoken to to start her quest. 
Once you start her quest, on your second arrival the Spriggan can be found. Killing the Spriggan will trigger SRC.
If you didn't continue the quest, S'vashni will still be there. I didn't want to force you to continue the quest.

Rift Watchtower:
-Disabled all problematic 3DNPC references

Riverside Shack:
-Untouched
Amsien will go there nevertheless, continue his quest to get rid of him. I did change his sandbox package link to an object that doesn't get disabled (just in case).

Falkreath Watchtower:
-The destruction mage is now meditating below the tower
The quest points to him correctly, so you should have no trouble finding him. 
-Made the mage unaggressive to guards.

Cracked Tusk Keep:
-Moved quest markers to different tower
-Removed problem causing parent links
The quest is part of a series of quests so I didn't want to remove it. If you cleared this location prior to the quest you will probably find the bandit is already dead and the Khajiit is rescued by the guards.

Bannermist Tower:
-Moved sack to a place it stays at all times

Ironback Hideout:
-The Alteration mage and fine guys can now be found resting in the mountains, just below Ironback Hideout

Snowpoint Beacon:
-Untouched
You can meet the npc as usual.

Pinefrost Tower:
-Finalised navmesh so NPCs can use the trapdoor.
Wreck of the Brinehammer:
-Untouched
You can do the quest without issues.