As KC8VWM said above, a good known good design has to be copied exactly. Including detail of boom and element size, attachment method, insulators, etc.... And feedpoint geometry, spacings, interconnect lengths, etc... --- all very important on the higher bands like 70 cM. IOW, if you are spending a lot of time simply trying to get the SWR down, you can end up with a yagi with low SWR but that is way down on gain for the SAME reason(s) that the SWR didn't match the original design in the first place. Chances are that whatever is different from the original design to give you high SWR is ALSO going to hurt the yagi's gain. It may be a good idea to step back and review the design and your implementation and try to figure out WHY it isn't duplicating the results of the original design.... rather than cutting and pruning and changing feed methods to simply get the SWR down. I love homebrewing and think it's a great way to learn!......but don't get in too much of a hurry and end up fixing only the SWR issue, while possibly masking other issues. It can be a lot of work, but once you get it right you'll know you have an antenna with good match to 50 ohms AND high gain. GL!