i recently had the same problem...i could only find general fert like 10-10-10 or bloom fert like 5-15-15...couldnt find a nitrogen rich one...closest i found was 7-3-7

i think in future ill just buy online so i can et exactly what i want.

the problem with having nutrients in the soil is that you can get sudden unexpected doses of fert, when your adding extra liquid fert it can make things a bit unpredictable.
if you get soil designed for seedlings/cuttings it will have only mild ammounts of fert compared to others, so thats probably your safest bet.

my last grow was done all the way through with miracle grow "moisture control for pots and baskets" soil and was a sucsess. however i did have burn problems towards the end when stacking extra bloom fert on top during flowering.... i didnt use any fert during veg. luckily harvest time came before the buds were affected but it destroy most leaves on one of my plants....just lucky timing i guess.

my current skywalker seedlings i actually put in the same miracle grow soil straight after germination( i had some left over) and are doing great, but im not going to use it when i re-pot them.
there are also quite a few different types of miracle grow soil... i think some are obviously more suitable than others.