Using VOX doesn't help anything.
The problem with the FT-1000MP MK V is they shipped with too much "TX gain." That can be turned down via a hidden menu that's not discussed in the manual.
However W8JI addresses this on his website, here: http://www.w8ji.com/ft1000mk_v.htm
For solving the key click problem, there's a lot on that near the top of the page; for turning down the TX gain to prevent overshoot, splatter and stuff that can destroy the ALS-600, scroll down to the bottom of the page and the instructions are given.
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