OC settings

hi, i have two 3070 they just put invalid shares not a single accepted, the settings are c1150 m2200 Pl150 ( they work ok on ETH,ETC all other) i tried to go absolute and offset clock – the same, tried c1050 mem 2000 also the same. Hive is showing in my opinion high MHs 29.0-29,7 i mine on 2miners with NBminer

any advice? thx

"kawpow – #18 Share rejected: {"error":[23,"Low difficulty share",null]}, 30 ms. [DEVICE 8, #12]"