You could always add Koolada, Peppermint, Menthol or a combination thereof @Cloud-FF7 for more of a throat hit.
And with the salts and freebase, if you reach a limit that you can tolerate the harshness of freebase but it just doesn't quite give you the nic fix that you need. You can then add salts to get upto the total that you need.
Currently im at 6mg/ml,next time i buy e-liquid ill go up to 9,want to do it slowly and not rush it.
but yeah this whole thing is more trial and error than i previously thought,but i guess everyone went thru the same thing when they started.
Well i started november 2018 but until now i have just been cruising thru,not really putting much thought into it.
Now im trying to save up for a new mod,my swag 80 looks kinda tiny with the Innokin Zlide on it hehe