I do. I believe it is to do with the Toughness attribute.
With:
Level 20
No gear.
Soldier: Capable x2
Soldier: Pain Resistance Program x2
Praetorian: Impervious Wall x1
Praetorian: Iron Skin x2
Praetorian: Perseverance x1
Praetorian: Retaliator x1
Siegebreaker: Inexorable Vitality x1
Siegebreaker: Futile Endeavour (+20% Block Efficiency) x1
Siegebreaker: Unsunken x1
Siegebreaker: Disallowing Vessel
Siegebreaker: Secure Parry
10 Inexorable points
I have Health Regeneration of:
1806.9 with 190 Toughness.
1811.5 with 191 Toughness
1852.7 with 200 Toughness
Hope this helps.