If the pain is coming from the bone spur it won’t resolve until the bone spur(cause of the pain) is removed.
Its like breaking a credit card. You can keep bending it until it  breaks. With the bone spur impacting the achillies attachment same thing can be occurring.
What Does That Heel Spur Likely Mean?
Are you addressing the motor patterns which caused the heel spur to develop?

There are several episodes which address different aspects of the ankle/ankle rom.
Has anyone taken a look at your running technique?

Does the skin around the ankle joint slide?
A couple episodes to start with.
Episode 258: Ankle Mobility-Self Mulligan Technique
Episode 285: Sliding Surfaces; Ankle Range of Motion Case Study Part 1
Episode 285: Sliding Surfaces; Ankle Range of Motion Case Study Part 2

Jami and Roop have a 5 part ankle and foot series
Roop & Jami’s Excellent Foot & Ankle Adventure | Part I