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By my calculations, if we dump 10 kg of photosynthetic micro-organisms (from Earth) into the upper atmosphere of Venus, there will be 10 kg of dead photosynthetic micro-organisms within 20 minutes.
Venus does have many perks over Mars, though. As you pointed out, the gravity is more similar to Earth's. Also, Venus is closer than Mars (on average), and there is more energy (sunlight) available. Ultimately, I think it would be far easier to establish a base in orbit of Venus (or high up in their atmosphere) than to try to terraform it. Even if we knew exactly what we were doing, I would be surprised if any terraforming strategy could be successful in less than 50 million years (try getting an investor for that!)