I've owned a Aviaster, the carb is similar to Tower, Chinese random quality control. I sent in the Aviaster, SIG replaced it. Then I had a good engine, but sold it not really seeing the advertised power anyway. OS has the best carbs in the business, and costs a premium.
The Thunder Tiger Pro 46 is a balance between price and quality you won't regret. You might find a used OS or second hand new one, and achieve the OS quality for the TT Pro price.