If weight loss is your number one priority, then I’d recommend sticking to ~500 calorie deficit while doing SSB. You can do a lot of SSB without putting too much stress on your system. You are dieting so that adds to your bodily stress and you’ll need to manage that with your other workouts (lifting and rowing).
The suggestuon from @BMAC615 is spot on, add a lot of veggies to your diet to help you feel full. Doing a low calorie density diet (think really large salads or giant bowls of broth based soups packed with vegetables) combined with SSB is how I lost ~8lbs in 9 weeks this winter (even while indulging in the normal holidays treats). Also take into account your nutrient timing, I workout first thing in the morning so for my harder rides I would make sure to have a more carb centric dinner the night before and then take on some easy to digest calories pre-ride, and have breakfast (oatmeal) afterwards so I’m refueled and not starving all day.