Why can E*TRADE fill my 2-leg covered-call rolls at prices where IBKR, Schwab, TradeStation cannot?

I have been doing side-by-side testing of 1-contract covered-call rolls at several brokers.

The options were approximately **30 DTE**. I submitted essentially identical **2-leg complex limit orders** at approximately the same time and adjusted the net price in $0.01 increments.

In repeated tests, E\*TRADE was able to fill these rolls at net prices where the same orders at IBKR, Schwab and TradeStation remained unfilled. The difference was repeatable enough that it did not appear to be just a single lucky fill.

I am specifically talking about **native 2-leg complex orders** (buy-to-close the existing call and sell-to-open the new call), not manually legging into the position.

Has anyone else done similar side-by-side testing of covered-call roll execution across brokers and observed a consistent difference? If so, which brokers have given you execution comparable to E\*TRADE for small complex orders?