As in energy, there’s quite a few idiosyncrasies and “local knowledge” with the interest rate markets. Specifically - the futures products like Eurex and CBOT that are fungible. Rollover, especially with the shorter duration products, at times does factor into things as the CTD changes. And that’s why you are using the corrected, consolidated data - which is the right thing to do. And that’s also why CBOT publishes a fresh ICS ratios .pdf flyer every quarterly rollover.
I mention this because with the CBOT ICS market, those 1 lots you see in the DOM are executed in ratio’ed allotments if 10. So, if you for example bought a one lot in your simulator, just be aware that in reality that’s a 10x6 (or other exchange appropriate assigned Ratio) position. So, for example, if in the ICS market DOM you see a 12 lot offered - that’s actually using my previous example ratio 120x60.
When you get beyond SIM and into real markets, a 10 lot CBOT Spread in the longer durations can have quite a bit of risk in them - they can move half a point ($500 per one lot) easily.
And for that reason, when clients go live, I typically recommend that they leg a 2x1 or 3x2 - it’s not perfectly hedged, and I do show my clients how to leg spreads manually hopefully without butchering the thing. Personally I learned the craft down in pits in the 90’s.
Hopefully I’m not discouraging you, but just relating some practical consideration for going live with these.
Another point I want to impress upon you is to really be patient picking your spots. And if there’s not a trade in the CBOT I guarantee you there’s one in the Eurodollar, Euribor, or Eurex markets. Cherry pick. Be patient and reactive in terms of your trade entries.
There’s a lot of really big spec traders that are into this trade, and it’s for a reason. Best of luck with things and keep posting !