I would suggest you stick to your 25-30mg and do it only once a day... That's the perfect dose for me too... I went from that to using twice a day and ended up addicted and went through withdrawal... Stick to just once a day and space them apart so you don't WD, or you'll hate yourself later... But to answer your question, you can dose twice a day and be fine.. Like few hours after you get up and after 6-8 hours dose again, although IME the second dose of the day never makes you feel as good as the first one so it is like wasting them.. You might as well save them for the next day and at the same time you prove to yourself you got some self control
In fact, I feel like each time you do it, it gets less and less euphoric, even as you increase the dose, idk if I'm the only one who feels like this but I still remember those first times and I feel like I am always still chasing those times, but can never feel like that again