Should I continue solo mining? 87mh 110ms

Hi there, I have 6 rx470 cards with 87MH on kawpow. I started mining on solo about 1 week ago and still no block was found. My ping to 2miners solo is 100-120ms. should I continue solo mining? or should I switch back to pool? what is your advice? Is my ping really high for solo mining? today my luck is about 16% shows in 2miners.