Might be a few good reasons to switch up to a more efficient stove, but criteria may be broader than just wieght. Size and weight are not the real objectives here as there is so little difference between all of them you really should be looking at your preferances and how the performance of each matches that, not just weight:

1. Get better gas mileage, for example you can make the small cylinder last 4.5 days if you're careful
2. Simmers better, which means you can use less gas
3. With higher BTU, may boil more quickly and get you going faster
4. One last thing, the F1 is pretty steady with the pot supports and that reduces the spill factor, especially with the lower profile cannisters

Just some other factors to consier, your analysis may have different variables.