I wouldn't risk doing half solo / half pool, I started several months back and yes I found have blocks but only on pools and after doing calculations the chance of completing that block to get the 50 coins is way too risky. I rather get some coins then no coins, and just sitting there spending money on electricity and hoping to solve that block doesn't sit well with me.
At the very least If you want to try solo I would pool till you made the cost of the electricity that month and then go all in.
Don't split your resources unless you bring in some serious Ghashs