To be completely honest, ive never used ILGM Nutrients. Im sure they work just fine, I just prefer what ive been running. If I was going to switch? Itd be to Jacks 321. Easy decision there.
I vote you run you coco lightly amended with EWC. Perlite is optional but Im always a fan of perlite. Then since you have Bergman’s nutes, give them a try. Can always upgrade later.
Yes follow the schedule but remember, LESS IS MORE. Start low and slow. 25-50% what they show. If the plants fine with it, stay the course. If she wants more, up the feed. If you get burned tips, less and more water.
Screw that 
pH pen and definitely screw that soil meter. U too Tezz! We all know better. Make that $50 investment in urself and grab the Apera. Thank me later. Lol.
In soil pH is optimally adjusted between 6.3-6.8 throughout the grow. But ur not in soil, I am.
You are expecting to be in coco. 5.8-6.2 is the range you want to be in.