My current main climbing partner is a guy who's at least 25 kilos heavier than me. I can belay him without a problem on the top stop system we have, but I already notice the weight when he's hanging on the rope for a while trying to figure out the next move. The thought of belaying him without top stop seems kind of unsafe?

I mean, I heard there are vests you can wear to match your weight but the thought of weighing myself down with 20 kilos doesn't sound very appealing, either.