00:53:958 (1) - it's common to use sliders to replace streams in lower diffs but I would at least use a reversed 1/1 which would contrast with 00:52:578 (1,2) in order to express buildup
01:15:854 (4,1) - I understand that you want to start the slider on 01:16:027 to match the start of the denser rhythm but I would recommend continuing your usual way and start it on 01:15:854 as the players will have build the expectation to hold on this sound: