Dont worry. 75c its ok, My -tt in claymore is 75. And my hash rate with bios mod and blockchain drivers is 28 mhs (mem 1950mhz, clock 1400mhz, Asus strixx 570)
But this hash is about agoust (the dag increased quite a lot since then), right now i'm not minnig eth, cryptonight is very profitable in these times.