I know grapefruit potentiates dm and caffeine but I feel like it would be much easier just to dose it to exactly what I want instead of relying on how much I think the grapefruit would add to it.
Also is there any reason you think that 200 would be better then 240? In my experiance 240 is the perfect dose because I can still function and act mostly normal but I feel a good intoxication. I like to stay with drinking one Dr.Pepper (68mg caffine) because if I drink anymore I get a little bit of anxiety while one drpeper actually makes me less anxious. Is there a reason you think 100mgC would be better?