Searching on the DSL Checker will tell your cabinet (which is specially helpful if your street is covered by more than one), and then if you search for your locality on telecom trariffs it will show you a list of cabinets and respective vendors.
The 100% figure you have just refers to how much of a postcode is covered by a specific cabinet. If your postcode is 100%, then the cabinet that precedes the figure is the one that covers.
Anyway, if the vendor for your cabinet is Huawei then you could be in for an improvement if the line is stable enough - towards 60 Mbps seems likely. If it's ECI, then there could be a small gain from DLM turning off interleaving it's stable.
If they cannot get the line to exceed the minimum guarantee then you may be eligible to leave contract. But this is not an IP Profile or Banding issue - the former has nothing to do with sync speeds directly (rather influencing throughput, and is based on sync speeds) and the latter does not appear to be in play here.