I'd say lower the dosage a bit and play around with the timing some more.
Instead of taking them 50 min apart, try 15 min apart...
Something else to try is to take the harmalas and spice together but split it up into two doses.
Eg,
1st dose, 200mg harmalas, 75mg spice;
2nd dose, 20 min later, 150mg. harmalas; 75mg spice;
If you're still not where you want to be, then smoke a little freebase spice or changa to dial in where you want to be.
Convert a melodic element into a rhythmic element...