From my experience of catching the train for 4 years, up until 6 months ago, you’ll probably be fine catching the 15.54ish train. If you get there a good 10 mins early you can make sure to get your bike on whilst its still quiet. There is often a bike storage area on the train. The 16.24ish train gets busier from people escaping the office a little early. Again if you get there in good time you’ll probably get your bike in the storage area. Anything later gets full to the brim with standing room only, a bit of a sardines game, until the 6.20ish and 7.20ish trains when they become pretty empty again.