The signal quality is indeed very good.
In your case, I would consider the fact that RUT240 has only an LTE Category 4 modem, which, theoretically can achieve better performance, however, only under certain conditions. One of the major limitations of this category is that it is not capable of Carrier aggregation, which, if other bands offer similar performance, would provide a significant increase in speeds. Even a single band performance of this modem is inferior compared to higher category modems. Depending on the modem used in your phone, I assume that might be the case.