I believe that is the minimum requirement and should suffice. Apply by 5th April 2019.
I did also submit PAYE ref letter ( for business registration purposes/optional and NOT essential as BR is also evidenced by bank letter/CT600/CT41G/CAR/RTI) and personal bank statements+payslips (preceding 3 months/No longer required by application). I received ILR August 2018 within less than 3 months.