RAX120 AND EAX20 WITH MESH

Dear All

I have a Rax120 with a hard wired eax20 in AP mode. They are both connected to a prosafe 8 port gigabit switch GS106ev3. Wireless connectivity is OK buy I want to try and speed things up. When mirroring tv to ipads or phone using smartthings tends to drop out quite a lot. Is it worth adding a eax80 or adding a mesh system to my current setup. I also have a netgear 314 nas. Would it be a advantage to connect eax20 and rax120 directly bypassing the switch?

Thanks in advance.

Simon