I don't need agents to send me any listings. I usually pick out which ones I'm interested.

I gave one agent 1-4 homes to look into and not really feeling good about his responsiveness. I was wondering if I can use another agent to give 5-8 home listings to try to nab something quickly in this crazy sellers market. I would not give them the same homes but should I be upfront with them? I don't plan on signing any exclusive contract. 

I provide the list. They contact the listing agents to get a feel. I don't plan on seeing the property physically. I plan on bidding high with intent on winning with few contingencies. I'm not sure about offering multiple bids simultaneously.

please comment if this is unethical.