Do you mind sharing which custodian you previously used?
I am considering moving an IRA from IB to an outside custodian to trade with my non-IB FCM and will want to avoid them if I move forward.
I am not very familiar with Tradestation, but they might be another self-custodian option for IRAs, however, their "Free" commission pricing does not look very competitive compared to a traditional FCM.
I checked and IRA Services Trust was bought out by Forge Trust Company.