Ya your thorns is so low. I have 320k with a level 100 thorns gem(it was like 301k with a 90 or so).
Thorns is massive since there is so many multipliers that effect it. Even 10k thorns is a lot of damage.
Using the D3Planner from the 4p GRift Guide:
http://www.d3planner.com/596585260
If you simply make changes to the level of the Boyarsky's Chip Gem in the ring, you can see the changes on the Thorns of the main screen and the subsequent differences in the DPS on the Skills tab.
Boyarsky's Chip Impact
(How Thorns scale your damage)
[TABLE="width: 800, align: center"]
[TR]
[TD="align: center"][/TD]
[TD="align: center"]
No Chip[/TD]
[TD="align: center"]
Level 0 Chip[/TD]
[TD="align: center"]
Level 50 Chip[/TD]
[TD="align: center"]
Level 91 Chip[/TD]
[TD="align: center"]
Level 100 Chip[/TD]
[/TR]
[TR]
[TD="align: right"]
Chip Bonus - Added Thorns[/TD]
[TD="align: center"]
0[/TD]
[TD="align: center"]
16,000[/TD]
[TD="align: center"]
56,000[/TD]
[TD="align: center"]
88,800[/TD]
[TD="align: center"]
96,000[/TD]
[/TR]
[TR]
[TD]Base Thorns [on Sheet][/TD]
[TD="align: center"]196,000[/TD]
[TD="align: center"]220,000[/TD]
[TD="align: center"]280,000[/TD]
[TD="align: center"]
330,000[/TD]
[TD="align: center"]
340,000[/TD]
[/TR]
[TR]
[TD]Steed Charge Damage[/TD]
[TD="align: center"]4.1 Billion[/TD]
[TD="align: center"]4.6 B[/TD]
[TD="align: center"]5.9 B[/TD]
[TD="align: center"]7.0 B[/TD]
[TD="align: center"]7.2 B[/TD]
[/TR]
[TR]
[TD="align: right"]. . .Steed Charge
on CoE Rotation[/TD]
[TD="align: center"]12.3 Billion[/TD]
[TD="align: center"]14.0 B[/TD]
[TD="align: center"]17.8 B[/TD]
[TD="align: center"]21.0 B[/TD]
[TD="align: center"]21.7 B[/TD]
[/TR]
[TR]
[TD]Bombardment Damage[/TD]
[TD="align: center"]19 Billion[/TD]
[TD="align: center"]21.6 B[/TD]
[TD="align: center"]27.5 B[/TD]
[TD="align: center"]32.3 B[/TD]
[TD="align: center"]33.3 B[/TD]
[/TR]
[TR]
[TD="align: right"]. . .Bombardment
on CoE Rotation[/TD]
[TD="align: center"]57 Billion[/TD]
[TD="align: center"]64.8 B[/TD]
[TD="align: center"]82.5 B[/TD]
[TD="align: center"]96.9 B[/TD]
[TD="align: center"]100.1 B[/TD]
[/TR]
[/TABLE]
Remember that your DPS is based primarily on Bombardment from the skill on your bar as well as your belt. Steed charge is the secondary damage. Consecration does about 20% of the damage of Steed Charge.
This is why Boyarsky's Chip makes the LoN Bombardment build possible. It adds over 50% more damage on CoE rotation at level 100.
If you include Hexing Pants into the calculation, Bombardmnet on CoE rotation does about 121.8 billion damage with a level 100 Chip.
At level 91, the Chip is 10,000 sheet Thorns less than a level 100 Chip. The differences aren't as pronounced as I thought they would be, but look at the overall damage scaling, every bit eventually matters!