Run off e.c

I'm growing in Coco and I'm now starting my 6 week of veg. I've been keeping my e.c level on the lowish side. At the moment the feeding EC is 1.3-1.4 however my runoff EC is like .7 and .8 . My pH range between 5.7 and 6.0 . The plants looks well and no deficiencies could be seen. Are there any serious concerns about this low Ec run off.