Suricata

I have a problem in using suricata as ids mode in idc 10gbps environment.
I found finallly flow recycler cleanup flows slower than flows created. this lead to flow spare queue decrease to zero and recycle queue very large。especially when enter emergency mode，flow manager module schedule more frequent than flow recycler module。

I decreased flow-timeout conf，configed more than one flow recycler modules， but not effictive as assumed。
flow:
memcap: 2gb
hash-size: 1048576
prealloc: 1048576
emergency-recovery: 30
managers: 1 # default to one flow manager
recyclers: 6 # default to one flow recycler thread

flow-timeouts:

default:
    new: 30
    established: 200
    closed: 5
    bypassed: 100
    emergency-new: 10
    emergency-established: 100
    emergency-closed: 0
    emergency-bypassed: 50
  tcp:
    new: 20
    established: 200
    closed: 5
    bypassed: 60
    emergency-new: 5
    emergency-established: 100
    emergency-closed: 0
    emergency-bypassed: 50
stream:
  memcap: 2gb
  checksum-validation: yes      # reject wrong csums
  prealloc-sessions: 65536      # sessions prealloc'd per stream thread
  inline: no                    # auto will use inline mode in IPS mode, yes or no set it statically
  bypass: yes
  reassembly:
    memcap: 10gb
    depth: 512kb                  # reassemble 1mb into a stream
    toserver-chunk-size: 2560
    toclient-chunk-size: 2560
    randomize-chunk-size: yes
    #randomize-chunk-range: 10
    #raw: yes
    segment-prealloc: 65536
    #check-overlap-different-data: true

The stats as below:
------------------------------------------------------------------------------------
Date: 7/23/2018 -- 16:05:28 (uptime: 0d, 00h 59m 29s)
------------------------------------------------------------------------------------
Counter | TM Name | Value
------------------------------------------------------------------------------------
flow_mgr.closed_pruned | FM#01 | 77801406
flow_mgr.new_pruned | FM#01 | 14559621
flow_mgr.est_pruned | FM#01 | 17102653
flow_mgr.bypassed_pruned | FM#01 | 910
flow.spare | FM#01 | 142790
flow.emerg_mode_entered | FM#01 | 1
flow.tcp_reuse | FM#01 | 2266271
flow_mgr.flows_checked | FM#01 | 9386320
flow_mgr.flows_notimeout | FM#01 | 3213988
flow_mgr.flows_timeout | FM#01 | 6172332
flow_mgr.flows_timeout_inuse | FM#01 | 1446235
flow_mgr.flows_removed | FM#01 | 4726097
flow_mgr.rows_checked | FM#01 | 1048576
flow_mgr.rows_skipped | FM#01 | 4
flow_mgr.rows_empty | FM#01 | 341
flow_mgr.rows_maxlen | FM#01 | 67
tcp.memuse | Global | 1804674600
tcp.reassembly_memuse | Global | 10737418208
dns.memuse | Global | 1398589
http.memuse | Global | 2783051133
flow.memuse | Global | 2147483488

Is there any method or slolution for this problem?