ponytail for platinum

This is all a matter of opinion, based on my playstyle. If you don't agree, that's fine. Don't really care if you think it's bad advice, but I'll try to explain my rationale anyhow.

I was skeptical of anti-shield pull until I experimented with it myself by leaving Shockwave at 1. Maybe it just goes with my playstyle... but using area pull allows me to prime more multi-detonations whenever I want without putting singularity on cooldown. It's a quick-cast, fast cooldown immobilizer that saves my life constantly. I would not be able to survive in close-quarters like I do without it. Adhis, even in groups are easily neutralized. It's decently effective at shield-stripping but that's not it's primary use... For blue bars I usually soften with my weapon, then use pull when they drop below half-shields. I can render Annointed helpless on the floor VERY quickly. The biotic combo seems to work for me the way I do it. It does proper combo damage every time. I can't recommend area/anti-shield pull enough, it's CC is essential and always available due to the short cd.

There is very little difference in practice between Shockwave 1 and Shockwave 6 imo. The only useful evo that I see is Reach, but that isn't really necessary with my playstyle. It does 'noodle' damage no matter what, it's primary use is for multi-detonations. Area-pull is the superior CC ability by far. It has better range, and is more reliable. Shockwave does what I need it to at 1 point. It's not worth the investment imo. End of story.

Biotic Expert is pretty much a no-brainer. The alternative is useless the way I play her... this isn't a weapon platform and I don't use melee on her. The extra biotic damage adds up with her passive abilities and equipment...

which brings me to singularity explosion. It may seem like that base 700 is small (I agree), but it is very useful on platinum especially where large slow-moving targets are in abundance. The radius is quite large already... expansion is not necessary. I find that after detonating singularity with shockwave, the affected targets usually have some health left. I can follow up the multi-detonation with a singularity explosion. That's a lot of AoE damage and CC in a short amount of time. My killfeed is dominated by singularity because of the explosion when it dies. 

To be fair, I've been considering the expose debuff over combo damage for awhile. I've been hesitant, but debuffs are very useful on platinum. Shouldn't affect combo damage that much because like you said... shockwave is already gimped in that area. It's also mitigated now with the veteran bonus that's easily maxed (being a common char). I'm definitely going to try it out.

In summary, you're wrong and I hate you.