Min values from multiple sets

I am attaching a worksheet for which I need to calculate "National Points". I need to select 5 lowest values from "Tech" and "Speed" (Row 3 headings) events to the left of the totals column but a minimum of three "Tech" values need to be used. I have used the min, small 2, small 3 for the "Tech" set then used an IF statement for the fourth value. The formula returns the correct sum for values up to the fourth value. The problem comes on the fifth value. It seems to depend on if the 4th and 5th value come from the "Tech" events or "Speed" events. I have calculated the values manually and am unable to get them to correspond all the time. Can anyone help?