Using "cryptonight_type" : "heavy", at hashvault sumokoin hashrate become low from 400 to 349

[2018-04-06 16:44:00] ADL initialised successfully!
[2018-04-06 16:44:00] Connecting to pool.sumokoin.hashvault.pro:5555
[2018-04-06 16:44:00] Connected to pool.
[2018-04-06 16:44:00] Pool difficulty: 50000
[2018-04-06 16:44:00] Pool sent a new job (ID: E/Ry9SoPgarEad9X9DfTfSpVhZO/)
[2018-04-06 16:44:00] Pool sent a new job (ID: eKPkEyN1oL6zWI+vn4a3wzCw9mVW)
[2018-04-06 16:44:02] Pool accepted result 0x0000E8F0
[2018-04-06 16:44:03] Pool difficulty: 499996
[2018-04-06 16:44:03] Pool sent a new job (ID: xfUrTkBCiD3l8Df9LnWkhCnFjKYt)
[2018-04-06 16:44:04] Pool accepted result 0x0000770E
[2018-04-06 16:44:17] GPU0[T0]:     348.0 H/S (T: 38c, RPM: 2037)
[2018-04-06 16:44:17] GPU0[T1]:     349.0 H/S (T: 38c, RPM: 2037)
[2018-04-06 16:44:17] GPU1[T2]:     351.0 H/S (T: 42c, RPM: 2247)
[2018-04-06 16:44:17] GPU1[T3]:     346.0 H/S (T: 42c, RPM: 2247)
[2018-04-06 16:44:17] GPU2[T4]:     349.0 H/S (T: 42c, RPM: 2269)
[2018-04-06 16:44:17] GPU2[T5]:     350.0 H/S (T: 42c, RPM: 2269)
[2018-04-06 16:44:17] GPU3[T6]:     349.0 H/S (T: 41c, RPM: 2315)
[2018-04-06 16:44:17] GPU3[T7]:     347.0 H/S (T: 41c, RPM: 2315)
[2018-04-06 16:44:17] GPU4[T8]:     342.0 H/S (T: 40c, RPM: 2216)
[2018-04-06 16:44:17] GPU4[T9]:     354.0 H/S (T: 40c, RPM: 2216)
[2018-04-06 16:44:17] GPU5[T10]:    348.0 H/S, (T: 51c, RPM: 1971)
[2018-04-06 16:44:17] GPU5[T11]:    348.0 H/S, (T: 51c, RPM: 1971)
[2018-04-06 16:44:17] GPU6[T12]:    349.0 H/S, (T: 41c, RPM: 2249)
[2018-04-06 16:44:17] GPU6[T13]:    349.0 H/S, (T: 41c, RPM: 2249)
[2018-04-06 16:44:17] GPU7[T14]:    349.0 H/S, (T: 40c, RPM: 2207)
[2018-04-06 16:44:17] GPU7[T15]:    349.0 H/S, (T: 40c, RPM: 2207)
[2018-04-06 16:44:17] Total:        5577.0 H/S

while at fairpool just work smooth:

[2018-04-06 16:47:47] Pool accepted result 0x001AB010
[2018-04-06 16:47:47] GPU0[T0]:     423.0 H/S (T: 40c, RPM: 2141)
[2018-04-06 16:47:47] GPU0[T1]:     406.0 H/S (T: 40c, RPM: 2141)
[2018-04-06 16:47:47] GPU1[T2]:     409.0 H/S (T: 44c, RPM: 2335)
[2018-04-06 16:47:47] GPU1[T3]:     418.0 H/S (T: 44c, RPM: 2335)
[2018-04-06 16:47:47] GPU2[T4]:     404.0 H/S (T: 46c, RPM: 2389)
[2018-04-06 16:47:47] GPU2[T5]:     424.0 H/S (T: 46c, RPM: 2389)
[2018-04-06 16:47:47] GPU3[T6]:     420.0 H/S (T: 44c, RPM: 2362)
[2018-04-06 16:47:47] GPU3[T7]:     403.0 H/S (T: 44c, RPM: 2362)
[2018-04-06 16:47:47] GPU4[T8]:     420.0 H/S (T: 43c, RPM: 2337)
[2018-04-06 16:47:47] GPU4[T9]:     410.0 H/S (T: 43c, RPM: 2337)
[2018-04-06 16:47:47] GPU5[T10]:    385.0 H/S, (T: 55c, RPM: 2008)
[2018-04-06 16:47:47] GPU5[T11]:    398.0 H/S, (T: 55c, RPM: 2008)
[2018-04-06 16:47:47] GPU6[T12]:    410.0 H/S, (T: 45c, RPM: 2379)
[2018-04-06 16:47:47] GPU6[T13]:    418.0 H/S, (T: 45c, RPM: 2379)
[2018-04-06 16:47:47] GPU7[T14]:    419.0 H/S, (T: 44c, RPM: 2345)
[2018-04-06 16:47:47] GPU7[T15]:    405.0 H/S, (T: 44c, RPM: 2345)
[2018-04-06 16:47:47] Total:        6572.0 H/S


Help please.....