Just want to share my findings:
(I haven't downgraded though)
I have the following distances with these firmwares (CE mode, no interference)
FW: 1.5.7: dist. 1,3 km (@250m alt.) lost video at that point. RTH. With this FW video did not reconnect on the way home.
FW: 1.6.8: dist: 0,9 km (@250m alt) lost RC at that point. Never lost video. Cancelled RTH as soon as it was on the way back within reach.
This firmware is supposed to reconnect lost video better, but since I didn't lose video at that distance I can't confirm.
I am happy with both results as it is only supposed to go 0,5 km, so I will stay on latest FW.
(The test with both firmwares are some weeks apart, so more dense vegetation now might also have affected/resulted in shorter distance with latest FW....)
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