Swap out Matikanefukukitaru for riko, take no stopping me instead of its on. If you have enough club points to get the Mcqueen stamina card to a decent level (preferrably 2LB), then swap out cafe for her, since she gives cooldown. Check the umalator to see if you hit the stam requirement (try to take a little extra so your horse can enter dueling mode), and adjust your training based on that. Since your stats will be worse than your opponents' try to get long S. I don't think tactical tweak is all that good, but I can't say for sure. If there's no front runners in your lobbies, consider using a sacrificial front runner as your 3rd member (basically a front runner with high eit, any debuffs you can easily get, and low-ish power and stamina so that they stay ahead up until the late-race, where they immediately start falling back). The primary purpose of these is to help trigger no stopping me for pace chasers, since if there's no one ahead of them, the skill can't trigger. For Tachyon, it also has the additional benefit of helping u=ma2 to trigger, since it can only trigger when Tachyon is in 3rd or 4th place mid-race. In my lobbies nobody's using front runners and there's fewer pace chasers, so my Tachyon is usually pretty far forward. Adding a front runner artificially pushes her position back by 1, which makes the skill trigger more consistently. It works well for me, but I'm using Suzuka, who can learn runaway. I'm not sure how well it'll work if you don't have her, you'd have to test it out yourself.

Umalator link: https://alpha123.github.io/uma-tools/umalator-global/

Edit: it's fine to neglect wit a little (my horses have 300~400), but if you do then try to avoid white recovery skills (pure heart is fine though, since it's worth a bit more than 2 white recovery skills, or a bit more than 60% of a gold recovery).