Elan Amphibio 86 - what length might be best for me?

I hired these for a week and really liked them. They were 176. I'm just under 188cm tall and weigh 78kg. I'm thinking of buying a pair, any advice about whether to stick to this length or go for the longer (184cm). I ski fairly easy these days, quite fast but nothing steep or bumpy, a bit of outside piste in nice conditions.
Any comments welcome thanks
Andy

I guess the fact that you are even considering size change suggests there was something about the ski which you didn't like? Long skis certainly feel more secure when you get on the back seat but they also highlight technical flaws on turn initiation I.e.slight reverse snow plough.

My own rule of thumb where the tips meet should be at or just below chin level I.e. effective length of ski with rocker removed. I would not worry about how fast your skiing, slalom skiers are on maz 165 and going faster that av. recreational skier at full tilt.

Appreciate this comment thank you. My feeling is to stick with the 176. They would pretty much meet your criteria at my height.

Back in the day on skinny skis I was on 205's and I think if anything I'm carrying a bit of nostalgia that pushes me towards the longer length option

cheers
Andy