I've been looking through the fight class maker. I didn't see anything to make sure shaman has buff on offhand weapon. Anyone have a fix for this or am i not looking hard enough?

I don't think it's a built in condition. You would have to use a lua condition.
Droidz posted an example here:
https://wrobot.eu/forums/topic/291-enhancement-shaman-weapon-buff-condition/?tab=comments#comment-1891

 

I use these to detect shaman buffs and they work well

    internal static class EnhancementHelper
    {
        public static bool HasTwoHandEquipped =>
            Lua.LuaDoString<int>("result = IsEquippedItemType('Two-Hand')", "result") == 1;
        public static bool HasShieldEquipped =>
            Lua.LuaDoString<int>("result = IsEquippedItemType('Shields')", "result") == 1;
        public static bool HasMainHandEnhancement =>
            Lua.LuaDoString<int>("result = GetWeaponEnchantInfo()", "result") == 1;
        public static bool HasOffHandEnhancement =>
            Lua.LuaDoString<int>("_, _, _, result = GetWeaponEnchantInfo()", "result") == 1;
    }

my implementation looks like this

    internal class Imbue : TTask
    {
        readonly ISpellService spellService;

        public Imbue(
            ISpellService spellService)
        {
            this.spellService = spellService;
        }

        public override int Priority => 999;

        public override bool Activate()
        {
            return (spellService.RockbiterWeapon.KnownSpell
                || spellService.WindfuryWeapon.KnownSpell
                || spellService.FlametongueWeapon.KnownSpell)
                && (spellService.RockbiterWeapon.IsSpellUsable
                || spellService.WindfuryWeapon.IsSpellUsable
                || spellService.FlametongueWeapon.IsSpellUsable)
                &&  (!EnhancementHelper.HasMainHandEnhancement
                    || (!EnhancementHelper.HasShieldEquipped
                    && !EnhancementHelper.HasTwoHandEquipped
                    && !EnhancementHelper.HasOffHandEnhancement));
        }

        public override void Execute()
        {
            if (spellService.WindfuryWeapon.KnownSpell && !EnhancementHelper.HasMainHandEnhancement)
                spellService.WindfuryWeapon.Launch();
            else if (spellService.FlametongueWeapon.KnownSpell && EnhancementHelper.HasMainHandEnhancement && !EnhancementHelper.HasOffHandEnhancement)
                spellService.FlametongueWeapon.Launch();
            else
                spellService.RockbiterWeapon.Launch();
        }
    }