Forum:Need help on GB

I have been using this deck on DN for quite a time, but there is some problem about it. Sometimes it seems to be quite vunerable to traps and such. Any idea? Here's my deck list:

Monster: 17 Gladiator Beast Laquari x3 Gladiator Beast Samnite Gladiator Beast Bestiari Gladiator Beast Darius Gladiator Beast Retiari Gladiator Beast Murmillo x2 Gladiator Beast Secutor Gladiator Beast Hoplomus Gladiator Beast Esquete x2 Gladiator Beast Dimacari Test Tiger x3

Spell: 15 Gladiator Proving Ground x3 Colosseum - Cage Of The Gladiator Beast x2 Infected Mail x2 Gladiator Beast's Battle Archfiend Shield Shrink x2 Monster Reborn Dark Hole Mystical Space Typhoon

Trap: 8 Gladiator Beast War Chariot x3 Solemn Jugdment Solemn Warning Mirror Force Waboku x2