Happy to send back some of the knowledge I’ve gotten on here. I’m still pretty new but there’s a ton of master growers on here including those that have helped you above.
Yeah I was looking at mixing them too at one point trying to combat my habit of over watering. I stumbled on some threads here though that warned against it. I know @OGIncognito used Coco Loco at least at some point with great success and I think it’s an intentional blend of soil and coco but I’m not sure why that mix works when others warm against the general practice. He may have a little more insight for you on what if anything additional would be needed for that case.
You always want to measure TDS and pH before a flush to be sure it’s needed. I don’t think you’re there either though, majority of leaves looking healthy just a little dark but they’ll use up that nitrogen through veg and stretch I’d bet. Here’s the approximate TDS by stage feeding chart I’ve been following. Then you want to feed so that your soil TDS sits around 1000. So if you measured 500 going in and then had 1200 coming out you’d feed 300 in the next feed and vice versa if it was 800 coming out. Sorry if this is stuff you know or if it’s been mentioned above, short term memory isn’t my best trait.