Clematis: Need clematis recommendation, 1 by LincolnRose

LincolnRose wrote:
Very frustrated here in Hood River, Oregon! Zone 8
I have two large white pillars on the front of my house. They are about 20' tall. I painted chickenwire white and wrapped it around the pillars so I could have a clematis climb up the pillars for a beatufiul display.

I planted 4 Niobe (2 for each pillar). I think they had clematis wilt because they lived for a short time, then wilted to the ground. I dug them up and planted 4 "The President". Same exact results. I cried. Then, I bought 4 "Kermesia" and planted them. They lived, but have not thrived. I have had them for 2 years. They grow about 4' then stop. They hardly flower, maybe 10 flowers total all year. I as so tired of looking at the chickenwire! It was a pain to install! This past spring I planted black-eyed susan vines in addition to the Kermesia. They grew about 12'.

I want a vine they will grow at least 18-20', have enough foliage to cover the pillars and flower as long as possible. My front garden is red, blue and yellow so I need to stick to one of those colors.

Any advice? Please? I am open to anything... they don't have to be clematis...