nrf52832 tweak the TX and adv range

In our application we exchange 10-byte packets of data bethween a cellphone app and uBlox NINA B112 which (according to its datasheet) is capable of 300m range. On practice, without tweaking anything in the files, we are getting 30-50m. We would like to try and extend that range to 100m. What parameters do we have to change to try and achieve that?

From what I already read on this forum, we need to set MTU size to 23, Phy to 1M, and adv and tx power to +4dB. Am I on the right track or cell phone limitations will not let me do that? Thanks