I have a price model I've been refining the last 2 quarters during the Asian session and my only drawback is that I don't have a predetermined directional bias during the Asian session (8pm eastern to 10pm Eastern) or I feel as if I don't.

I only use the 10year yield and the Dxy to help me and I trade solely Xauusd and have been gathering data for Audusd as of late.

Any tips would be greatly appreciated.

Not sure I understand your question but if your just trying to figure out what direction to trade in, why not start simple. For example, anytime your trading above vwap, your looking for longs, anytime below vwap, looking for shorts. Or picking a bias based on the direction of moving averages. Another one could be, if you are trading above/below the previous candles high/low on several timeframes, you trade in that direction. Sorry if I am misunderstanding your question