I split mine as I found that just having an evening dose was making it run out well before the 24 hours and I was going high in the evenings regardless of what I did.
I now split it equally between morning and evening and find the effects of my quick acting are easier to judge and usually I have fewer highs and lows (when I get things right :lol: )
It is certainly worth a try if you are struggling. I just knocked one unit off the evening dose each day and took the extra one the next morning until I had got them equal.
HTH
Angie