Welcome to ECF.
When my daughter and I were using cigalikes with cartomizers (similar to Blu), we found that anything from 80/20 to 65/30 pg/vg ratios were good for us - we sometimes even got 100% pg - all at 18 mg nicotine. When we switched to Evods with bottom coil clearomizers, that much pg was too harsh for us. We have found our "sweet spot" at 50/50 pg/vg. My daughter still uses the 18 mg nicotine for most of her eliquids, and I have been able to go down to 12 mg nicotine. Keep playing with your pg/vg ratios. You will find something that works for you.
When my daughter and I were using cigalikes with cartomizers (similar to Blu), we found that anything from 80/20 to 65/30 pg/vg ratios were good for us - we sometimes even got 100% pg - all at 18 mg nicotine. When we switched to Evods with bottom coil clearomizers, that much pg was too harsh for us. We have found our "sweet spot" at 50/50 pg/vg. My daughter still uses the 18 mg nicotine for most of her eliquids, and I have been able to go down to 12 mg nicotine. Keep playing with your pg/vg ratios. You will find something that works for you.