KV+XDCR System test: Possibly missing items in both uni and bi-xdcr

Build
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3.0.0-957(xdcr on upr, internal replication on upr)

Clusters
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C1 : http://172.23.105.44:8091/
C2 : http://172.23.105.54:8091/
Free for investigation. Not attaching data files. ran out of space trying to fetch them.

Steps
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1a. Load on both clusters till vb_active_resident_items_ratio < 50.
1b. Setup bi-xdcr on "standardbucket", uni-xdcr on "standardbucket1"
2. Access phase with 50% gets, 50%deletes for 3 hrs
3. Rebalance-out 1 node at cluster1
4. Rebalance-in 1 node at cluster1
5. Failover and remove node at cluster1
6. Failover and add-back node at cluster1
7. Rebalance-out 1 node at cluster2
8. Rebalance-in 1 node at cluster2
9. Failover and remove node at cluster2
10. Failover and add-back node at cluster2
11. Soft restart all nodes in cluster1 one by one

Problem
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See screenshot.
standardbucket(C1) <---> standardbucket(C2)
On C1 - 60990237 items
On C2 - 61052795 items
standardbucket1(C1) ----> standardbucket1(C2)
On C1 - 14064164 items
On C2 - 14064146 items

Bucket priority
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Both standardbucket and standardbucket1 have high priority.

Attaching cbcollect with xdcr trace logging. I see that views is no more reliable for comparing revID info. I'm writing a script to detect losses at the vb level. Meanwhile I did not want to delay your investigation. Feel free to use the clusters.