With those wallets that are not mixing at all (0%) it seems they have more "transaction not valid" messages
2015-06-19 14:36:38 Last Darksend message: Mixing in progress...
2015-06-19 14:36:38 receive version message: /Dash Core:0.12.0.1/: version 70077, blocks=70127, us=217.122.139.212:59961, peer=1015
2015-06-19 14:36:38 CDarksendPool::UpdateState() == 3 | 2
2015-06-19 14:36:38 CDarksendPool::StatusUpdate - set sessionID to 286575
2015-06-19 14:36:39 Last Darksend message: Submitted to masternode, waiting in queue .
2015-06-19 14:36:39 CDarksendPool::UpdateState() == 2 | 2
2015-06-19 14:36:39 PrepareDarksendDenominate - preparing darksend denominate . Got: 300003000
2015-06-19 14:36:39 keypool added key 4809, size=1001
2015-06-19 14:36:39 init message: Loading wallet... (480.42 %)
2015-06-19 14:36:40 keypool reserve 3809
2015-06-19 14:36:40 keypool keep 3809
2015-06-19 14:36:40 keypool added key 4810, size=1001
2015-06-19 14:36:40 init message: Loading wallet... (480.52 %)
2015-06-19 14:36:40 keypool reserve 3810
2015-06-19 14:36:40 keypool keep 3810
2015-06-19 14:36:40 keypool added key 4811, size=1001
2015-06-19 14:36:40 init message: Loading wallet... (480.62 %)
2015-06-19 14:36:41 keypool reserve 3811
2015-06-19 14:36:41 keypool keep 3811
2015-06-19 14:36:41 CDarksendPool::UpdateState() == 2 | 3
2015-06-19 14:36:41 CDarksendPool::SendDarksendDenominate() - Added transaction to pool.
2015-06-19 14:36:41 Submitting tx CMutableTransaction(ver=1, vin.size=3, vout.size=3, nLockTime=0)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 15), scriptSig=)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 12), scriptSig=)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 18), scriptSig=)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 4f84fb1d7224)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 5d2c7c4a705f)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 0d3f9b4715b7)
2015-06-19 14:36:41 dsi -- transaction not valid! CMutableTransaction(ver=1, vin.size=3, vout.size=3, nLockTime=0)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 15), scriptSig=)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 12), scriptSig=)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 18), scriptSig=)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 4f84fb1d7224)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 5d2c7c4a705f)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 0d3f9b4715b7)
2015-06-19 14:36:41 DoAutomaticDenominating : Running Darksend denominate. Return ''
2015-06-19 14:36:41 Last Darksend message: Darksend is idle.
2015-06-19 14:43:09 CDarksendPool::UpdateState() == 2 | 3
2015-06-19 14:43:09 CDarksendPool::SendDarksendDenominate() - Added transaction to pool.
2015-06-19 14:43:09 Submitting tx CMutableTransaction(ver=1, vin.size=2, vout.size=2, nLockTime=0)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 15), scriptSig=)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 18), scriptSig=)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 23ae83efdc20)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 8777ed55eb9b)
2015-06-19 14:43:09 dsi -- transaction not valid! CMutableTransaction(ver=1, vin.size=2, vout.size=2, nLockTime=0)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 15), scriptSig=)
CTxIn(COutPoint(5dec5c1e31f715f23333db3e557152ba7720f254e2fca2dafeab2dca4177fb0e, 18), scriptSig=)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 23ae83efdc20)
CTxOut(nValue=1.00001000, scriptPubKey=OP_DUP OP_HASH160 8777ed55eb9b)
2015-06-19 14:43:09 DoAutomaticDenominating : Running Darksend denominate. Return ''