I am using "Stockchart" with Fib on SPX 60 min, so Fib not affected by SPY divi. We get reaction at Fib's and also at major MA's. Do you look at MA's also, when making directional decision at FIB?
I believe none of the broker provided chart feeds adjust the look-back price history for each SPY quarterly dividend. Only Stockcharts uses div-adjusted look back price history as its default, although they added in recent years the ability to look at any symbol's price history NON div-adjusted as a user defined alternative to the default. This is the reason I consider only StockCharts for my reliable use of BB's and longer term MA's especially near the 3rd Friday of each quarterly quad witch when the Dividends are paid. I personally will not rely on trading directional reads based on price-calculated indicators or BB's that are not div adjusted. my 2c ... I am fine with using 16 hour all sessions price action for each day if trading some intraday swings based on 3 min and 15 min charts using: broker provided chart feed AND only when more than 3 days away from each side of the quad witch event.