I would do exactly what you are doing. Start at half strength and work your way up if you see more deficiencies. It is always easier to add nutrients then to take away if you burn them. I always found the PH and nutrient lockout was more likely to cause issues then an actual nutrient deficiency. Veg is just to get your plant ready for flower, so don't rush her and make sure she is nice and healthy before you flip. Good luck and happy growing! 👊