Crazy slow filling 20, 26, 30, 40 shares at a time. I don't think I have ever seen that. I put in a real share buy with no margin and it has taken over 6 fills and I only have 600 shares filled only a fraction of what I am trying to buy.
If you looking to buy and want to support your stock price as well, place all buys on the bid. Don't take them out at the ask. That way your orders act like support to the price. You will get filled every time they want to raid the stock making it a little harder to push it down unless they want to sell real shares.
Goes to show that all the ARNA market manipulated by mm trading naked shorts, probably mostly counterfeit back and forth to control price. Most shares are now in hands of loyal longs or institutes. None left to buy. JMO.