I've kept a Fission and Plasma Wave in my bag for more than a year now. Fission Photon in the past, Plasma Photon since the spring, looking for fade or skip. Fission needs more lateral movement, but stable, less lateral movement than a Star Mamba. Plasma more stable for hitting lines in the woods, best if I have a left center line for my LHBH. Since transitioning from 2-step to 3-step those discs will fly differently, more arm speed. IMO at our age and form building, weight matters.
Fission Wave for windy days in the open or lightly wooded I like to bag a 148g for downwind, but this year on a 3-step I'm getting more distance in a headwind vs downwind, that should change as I work on arm whip. The heavier the weight, the less lateral movement I can use them in wooded courses. The past few months a 159g and love it, stays in the middle with ending fade, use in the woods only. When its beat in more, I'll see if I can use it in the open for a more weighted downwind disc. I have a 162g, and 165g waiting for their turn, however long it takes to get there. When I get to the 165g perhaps around 170g? I'm currently working on arm whip with my 3-step, faster arm whip heavier weight.
My suggestion to you is if you had a comfort level with the Fission Wave 148-150g jump up on the weight perhaps around a 155g and work with it until your next comfort level however long it takes. Jumping up on weight for more stability, and with more arm speed distance. Have patience.
I've only been around a 170g when I had a few Fissions Photon's, best downwind on a fade, but not close in distance to the Fission Wave, so why keep it. I did try a 148g once, nowhere close to the heavier Fission Photon in distance. I like the Plasma Photon for stable wood play to hit lines and skip around doglegs, very short distance, but I don't have it for distance, that's why I have a Plasma Zenith, and a new DD1 for the woods. But you do need a disc for more fade than a wave will give you, so give it a try.
Plasma Wave love them, at this time inventory has been scarce for the past three months, nothing below 170g, I've been looking for new production a few times a week. There good for hitting lines in the woods with distance. When I had a 163g, I could hit 300 on an occasion in the woods normally less, when I wasn't hitting a tree, lost it back in June, none to be found, 167g less distance, lost it in August, 171g less distance. When production resumes, I plan on getting two 163g, seems to be my best weight in the Plasma.
It seems likely next year when I start on the 4-step, all this could change, as it did coming off the 2-step.
I saw your comment about difficulty with mid's. In the past 17 months flipping over to MVP/Axiom the Plasma Prism Pyro 179g from day 1 was an easy throw and has been a consistent fade/hyzer for the past 14 months. Eclipse Reactor 178g dead straight from day1 , developed an ending fade eventually, short on distance. My newest as of a month ago Neutron Reactor 173g left center and long past the Eclipse, and Pyro. Starting on day 1 as well. Eclipse Hex 174g took about 6 months from a turn to a nice long S curve now, and Plasma Hex 174g from a turn to left center took about 3 months. Failures both a Fission, and Neutron Hex nothing but turn, traded them when the Eclipse Hex arrived. Other brands from the past only a Westside Warship, and Metal Flake Roc I had success with, but took some work.
I hope these thoughts help you in some way, good luck!