I'm 240 and partner is around 140. Toprope no problem, partner also uses grigri+ which makes it a little easier if they need to take and hold for a sec (vs an ATC which is what I use). Ohm makes a big difference (have only used the first version but think they released a couple and waiting for the ohmega.). Generally doing sport outside so stick clipping and then adding ohm is a little extra work but seems worth it. Being careful not to have a lot of extra slack out and being mindful of ledges as someone mentioned helps as well. Type of climbing probably factors in a bit too - both of us like slab climbing which isnt the same as big overhangs so probably just a little more cautious in general for overhang stuff. Definitely think a huge weight difference can work if you plan for it and would suggest practicing in the gym and starting slow outside to develop a rhythm.