Foams really don't work for me so I default to silicone, but I found the Spinfit CP145's worked great on the A40's, unfortunately it had issues connecting in the case so I'm back to the stock silicone tips. CP145's aren't made for TWS IEM's specifically but they worked great until I had to sync them in the case (TWS specific ones are usually stubbier with a larger bore and fit better in the charging case).
SpinFit makes some TWS ones that I'm planning to try next. Also if you want to go cheap there are a lot of generic budget eartips on Amazon, Ali Express, Ebay, etc.