I have the Solo as well. I also taped off all the small vents here and there, even unused drive bays and around the optical drive, except for fan mounts and run everything with one 120mm exhaust.
When I bought it years ago, it was one of the quietest cases off the shelf. Now, it's pretty mediocre sound-wise and has terrible air flow compared to other cases on the market. My biggest gripe now is the PSU, which I now highly prefer to bottom mount, both for lower center of mass and better case airflow. Its current placement reduces the effectiveness of the rear exhaust fan. I actually added a duct directly to my CPU cooler and dropped temps there by 5 C under load (no changes in other temps).
Do note that noise will increase because you are adding fans in front, closer to you, the user, with less mass to dampen sound.
A few ideas:
1. Remove all the slot covers below your video card. Keep 120mm as exhaust. The idea is to help cool the exhaust from your video card before it circulates with the rest of the system. Or, you can also mount a fan over several unused slots if you have the room.
If you prefer one, it's not hard taping a filter over the slots or using my personal cheap-ass method of simply taping both sides and cutting narrow slits with a utility blade. I use the snap-off type that was common with print companies before digital presses. I assume poking holes works similarly.
2. Open up that second slot on your video card. Maybe 1/4th or 1/3rd of the hot air thrown off from the cooler heads towards the slot cover, so if you open it up, that's more heat that gets blown out. The stock grill looks to be quite restrictive. You can either scrap a single slot plate from a broken card with the same output configuration (and leave the 2nd slot wide open) or have at it with a rotary tool.
3. Look at other cards that use a slot cooler. They probably won't be as efficient, but at least they don't heat your overall system as much.
4. Get a bay cooler the Lian Li 3 x 5.25" fan mount. Set to exhaust or intake as you prefer, depending on rest of case and whether you add the bottom 92mm fans.
5. You can add a metal or other non-flammable non-conductive material (some plastics come to mind) plate to the middle of your system. This should block most of the vertical airflow between your video card and above it except near the rear fan. The idea is that most of the heat exhaust will only heat the air on the bottom of your case and exhaust almost immediately out the back. You will probably have to add a bay cooler or just remove one bay cover to feed air across to your CPU. I did this years ago with an Antec SX1040 case and it worked really well after a few tweaks. You can attach a plate and or L-bracket to the side panel. Just be careful not to crush/short anything.
5. I've seen PCI-slot exhaust fans. The single/double slot types are pretty loud, but move a good amount of air out the back. Another type I haven't tried side mounts the fan outside your case, so while it only draws (or pushes, it's reversible) air through a single PCI slot, the fan sits vertical to your case. The assumption being this way you can get better airflow with less noise. Have no idea how well those actually work.
6. The tried and true blowhole method. Cut a hole into your side panel to exhaust the hot air before it reaches your CPU. Alternatively, cut a hole to blow cold air onto your CPU area.
Another option is to cut a hole on top of the case and exhaust from there. The top panel is actually warmest in the middle of the panel, probably because of hot air trapped behind the PSU (mine's sealed with only a single bottom fan).
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