Simplify mutual fund historical prices download
Why don't you remove OHL price columns and the Volume column for mutual fund historical data downloads? The OHL columns will always match the Closing price column since mutual funds are only priced once per day after the market closes. A mutual fund download should only contain Date, Close price and adjusted close.
Also, I see on many mutual funds your prices for many dates carry six places beyond the decimal point. This is not possible since all fund prices are rounded to the nearest penny by the fund company.