Nice fish and nice pictures...I love steelheading, just don't care for the crowds....

Mauser..Your 5 wt. 8 footer should work just fine...I'm no expert fly fisherman, but I manage to catch my share on tackle similar to yours..My current favorite outfit is Loomis 9 foot 5 weight, but I've used 8 and 8 1/2 footers also...

I've had very good luck with white wooley buggers in 8 or 10, various sucker spawn patterns and various bead head nymphs from 12-16 in such patterns as black stone fly or prince... Use a strike indicator and add micro shot as needed to be sure you are drifting near bottom....For steelies you need to be ticking bottom..