I am using the Riva so it is close to the Ego. I have tried the 3.0 Boge's, got lot better flavor but still plugged up in less than 24 hours. I do have some old RY4 sitting here that is 100% PG. I will give them one last try with that juice and see if I get the same results as I have. My everyday juice is from either madvapes or FSUSA and is either a 70 to 30 ratio PG and VG or 50/50 so I will try the 100% PG just to be sure.
I'd say your 70/30 juice is probably just fine.