Grants takes a long time are you mixing the flavours first ,letting them steep a week then adding pg/vg.
Next best I've done is reloaded fro UKV site, still needs a week to come good.
Cap.Custard V2 10%, Cap. Caramel V2 4%, FA Maple Syrup 2% mix steep 2 day's then add the rest. t's not bad even when mixed on 3rd day.
Other and it's a straight mix and vape : 15% Cap Custard V1, 3%DDL, .5%TPA Brown Sugar.
As a note use a whisk when mixing plenty of air in mix will cut down the steeping time.
I'm mixing as normal, pg, vg, nic and flavouring at same time. Ive made the Grants custard before, actually its the only custard ive been making an like it. I know it does take time. I usually find that after a week or so it gets better.