First, Chase Credit Journey provides VS scores, not FICO. Secondly, you already took the inquiry hit when you first applied, the scoring drop is probably attributed to the lowering of your AAoA and possibly the reseting of your AoYA (if your previous AoYA was > 12months). Lastly, have you looked at the report and see what limit is reported with that card? Available credit could be affected by balance so I wouldn't rely on that.
