I dunno what “SL3” is but anything “Tarmac” is crap for flat races i.e. Crit City
see here: Zwift Speed Tests: Frame Ranking Charts - Zwift Insider and pick the fastest one you can unlock
Also if you don’t have Tron bike unlocked, start working on that, as it’s mega OP in any non-pure climbing races.
There are several DT Swiss wheels, ARC 62 are ok but not the best for pure flat courses. Zipp 808 are very cheap good wheels for flat courses, and there are many others that are even better if you have the levels/drops to unlock: Zwift Speed Tests: Wheel Ranking Charts - Zwift Insider
Every single Zwift racer knows it is most efficient to attack on hills, so most riders will be chilling on flats and nailing it above threshold on climbs. If you are already on the limit on the flats, ur gna have a bad time.
68kg is not what I would consider “lightweight” - it’s fairly normal. However there are a lot of 80-90kg riders in flat races that will destroy you at the same w/kg, and if they hold the cat limit, if you over-take them you are likely to get DQ’d anyway. (see here: Speed Tests: Steady w/kg Across Various Body Weights - Zwift Insider )
Want to get better in races?
- Unlock some better frames/wheels (ideally Tron)
- Work on your 15sec / 1min power and repeated efforts
- Spend more time drafting in the middle of a large pack, less time off the back/front
- Learn how to use powerups correctly
- Ride to your strengths - if you’re not a sprinter, don’t wait til the final 250m to make a move. If you don’t know your strengths or don’t work on your weaknesses, then don’t expect to win any races if you don’t have a plan for how you are going to win…!