40% of 1 1/4" is 1/2" so that would make your 3/4" feed too big according to the standards you posted. Also making it more than 53% of 1" conduit. You would need 1 1/2" conduit to allow the 53% usage spec for 3/4" wire. I'm assuming that since it is all sheathed together it would be considered one wire, also assuming they reduce the fill capacity for multiple wires because they expect them to be spread out more within the conduit due to not being bundled together thus taking up more space even though they have the same mass as a single wire feed. I'm not an electrician though, maybe a licensed one can add a little more info.