Usually that power spike upon key up issue can be solved by the addition of an external ALC voltage as most radios seem to have an issue with the internal ALC voltage acting fast enough. I tried it with my FT-857 and the spike was there with internal ALC control but gone with the addition of an external ALC voltage.
http://www.eham.net/ehamforum/smf/index.php?topic=31251.10;wap2
http://www.eham.net/ehamforum/smf/index.php?topic=31251.10;wap2