Calf Raise Video

Any advice on my calf raises? Before you say it, I'm using a Smith Machine because there's no rack available at my condo gym. It's not ideal but for this short range of motion, it should not make any difference. This is 177 lbs (80 kg) for 6 full reps. I weigh 147 lbs (67 kg) here. I'm 5'7" (170 cm)

https://youtu.be/Q5qD5EFLbgA