I'm trying to design a 50Ω coplanar waveguide to connect the output of a LoRa module to a SMD metal antenna. The two images below show the top layer (red) and bottom layer (blue). Vias are green and both copper pours are connected to ground. C7, C9, C10 are tuning components - not all will be caps and not all will be fitted in the final design.
Board thickness is 1.6mm, dielectric is FR4 (which I know isn't ideal and doesn't specify exact performance - cost reduction is important to this design). Feed trace width is 1.5mm, gap between feed trace and copper pour is 0.3mm and copper thickness is 35um. Operational frequencies are nominally 868MHz and 915MHz.
Does this look like it has sensible dimensions for a 50Ω feed? I used a few different online calculators (each of which with varying degrees of variable control) and it seemed close - but I have no experience of any RF work so I wanted to run it past some more experienced eyes. Also any general comments on the RF section layout would be welcome.
EDIT: Following on from @ThePhoton's comments, I have shifted the antenna feed slightly - see updated top copper image below: