Replying to Line Blend Owners?

I need new skis. I'm 5'7", 150 lbs, and have been skiing for over almost 25 years. I prefer super soft, center mounted, symmetrical, wide surfy style skis. For your reference I've been skiing the Line Anthems (171), Elizabeths (172), Invaders (171), and the Surface New Life's (184) for Pow out west for the past 8 years.

The ski I'm considering the most is the Line Blend. I haven't been able to demo it yet, but it sounds perfect outside of the fact it's not fully symmetrical, which really bothers me. Has anyone had issues with this transiting from center mounted fully symmetrical skis? Would you recommend the blend for my style of skiing?

Also, if I poll the trigger what length should I get, 171 or 178? I primarily ski East Coast. I ask based on the early rise. I want them to be really really playful so I'm leaning towards the 171.

Thanks for the help.