I had to register but your question was worth it.

I take 1x 30mg at 8am and 1x 30mg at 12pm noon.

That works well but not well enough. I also take a varied amount of Dexmethlyphenidate of 10mg. Normal is 1 at 8am, 1 at 12pm and 2 at 4pm. I start making mistakes after 10PM. On busy days I'll add as needed.

So 2x 30mg and 4x 10mg per day. You might consider adding the instant boost for those times you need it.