Eh, I prefer ARAB, just played a game on PG, and it's just as big a snowball fest as regular ARAM.
Could you think about upping the passive gold/EXP? It turns into a one sided stomp otherwise, which contrary to popular belief, is NOT fun for either party.
It's why I love ARAB, even though picks may be against your favour, the fact it lasts much longer and there isn't alot of snowballing makes it more fun imo.
EDIT: Maybe it's the passive that isn't the problem. Maybe it's the fact that turrets drop too easily. Perhaps look at upping the turret HP/armour? I don't know...it's just something feels like it's lacking, the games are over way too soon.