Before I completely forget I'll post my most recent solos:
Asari Valkyrie Sentinel
XAN1_95 | June 16 2016 | 28:09 | White | Cerberus | Venom
Pizza / Devices / Hack
This is what Collectors do to me.
How to sub-30:
1. Try to solo against Collectors
2. Get 7ws, and then keep getting spawned on by pyros during wave 8
3. Eventually wipe
4. Start raging
5. Set up an easy mode plat solo
6. Play as agressively as you've never done before
7. If you fail, keep trying. Failing -> more rage -> better gameplay.
For the record: objectives were crap, had 5 nukes for wave 10 where I used 3. Would have been sub26 if I nuked properly.
PS. Got the tricky
hack on wave 10, and for the first time ever, I finally cheesed it

Asari Valkyrie Sentinel
XAN1_95 | June 19 2016 | 27:14 | White | Cerberus | Venom
Escort / Pizza / Pizza
Marginally better objectives, but no rage -> scrubby gameplay as usual.
And just because I have no shame anymore:
Geth Trooper Soldier
XAN1_95 | May 25 2016 | 25:52 | Glacier | Cerberus | Reegar
Pizza / Pizza / Pizza
Time is relatively bad because this was my first try, and I have no idea how to play Reegar GT in a Plat solo at all. Btw all the pizzas were ****. (and yes, this is actually my first sub30, lol)