Push the ball is very similar to base offense, except faster paced, hence more points scored. It also will tire your players out slightly faster. For big men getting shots, you want either low post or look inside. Look Inside is probably most preferred by more people. All offenses are described in the manual
http://www.buzzerbeater.com/community/rules.aspx?nav=Tact...With PtB, you should take a roughly equal number of shots for all positions. Looking at your team, here is why your guards are taking more right now: Your best big men are injured, and your guards are fairly high salary for DV. That means they are getting good matchups and open shots instead of feeding the ball inside. When Naatanen and Chwaszcz come back, they should take a few more as well.