RE: 4.0m wave board
OK, then it sounds like and Acid will be it for you. Just as a remainder, the EVO 70 is a whole other ballgame than the EVO 74 when it comes to high wind - surprisingly different relative how similar they look in shape and dimension. I would say the 70 being a bit shorter and more slender in the nose area) has better control in the air than the 74 too. It also has more drive in the wave riding and at least to me (69 kilos but also very "EVOish" in my riding style) the EVO 70 is just perfect for dropping in waves when you really have a bit too much sail power. Despite the fact that the EVO 70 actually is a bit to big as a pure high winder for me, in some types of 3.5 wind conditions I still use it becaulse its so forgiving in the wave riding (and I do have both a PA68 and EVO 62 to choose from). The 07 version is and even better high winder.
But back to Pure Acids. It will depend a bit on wether you're keeping the EVO 74. The PA 68 is a nice board and particularly suited to high wind. It still has a fast and effective bottom shape, so it will not fell slow or too bogged down despite your weight. It is a very low volume board for 80 kilos though so you better be sure that you have reasonably stable winds when its nuking. It will probably be too big a step to the PA80, so if you intend to sell the EVO 74, the PA68 may maybe not be the best option.
The PA74 is definitely a class smaller than the 80 you have. It also has a tad more rocker, I think and softer rails than your current board so I beleive you will find it noticeably more controllable. The PA74 has a bit rounder outline and that really helps keeping it versatile in wave riding when the waves are not super clean and fast and when its not sideshore. Waves can be quite irregular and difficult on 4.0 cross on conditions, and than the shape of the 74 might prove very valuable. For me the PA74 starts to feel big at 4.0, but over 10 kilos more should mean it still very well within its range for you. BTW, in the proto stages, we tested a narrower version of the 74, but the 54cm wide version that went into production was a clear winnder and also in powered up conditions the production model was just a better board. In fact it is the best "traditional" wave board I've been on. One of these boards that just feels right.
So as a summary:
PA 68: Low volume classic blaster which will clearly be the most natural board in a straighline when fully lit with a 4.0. Super sharp on wave, particularly when drawing out your turns a bit.
PA74: Still a controllable board. Very versatile on a wave: loose and manouverable at slower speed but when speed builds you feel that it both has a solid dependable tail and lock in a high speed bottom turn very nicely.
Outsider, EVO 70: More bumpy but also more forgiving in a straightline. Super versatile on a wave and much easier to get vertical, especially in cross on conditions. When used to how it turns, its very good for dropping in with lots of power in the sail in the sense that you can drop in fast and kind of out of control and still get it together and gat lots of options on how you like to draw the turn towards the top.
Hope that helps.