I have used Fritz!Boxes since the days of ADSL. I currently have a Fritz!Box 7590 with a meshed 1750 repeater on a 74/20 FTTC connection, and I am seeing wifi speeds around the house in the high 60s. I particularly like the fact that I get a very low DSL error rate (which is easily monitored on the Fritz!Box), and a connection that remains stable between firmware updates. I also have VOIP connections to the Fritz!Box (more precisely a single VOIP connection with 3 VOIP-enabled DECT phones) and the quality of the calls is excellent. Personally, I would give the 7530 as try, you might be surprised how good it is.
Thank you for that. It is helpful.
Some years ago I was using Fritzbox Routers; I had a Fritzbox 7390 which did not have great Wifi but was generally OK, however, it did not have wireless AC and when I updated to the newer, (at that time), Fritzbox 7490 I found that the Wifi on Fritzbox 7490 I that received was very poor and I sent it back for a refund. - (I never used the phone system on either of them because when I tried it; both routers suffered from ghost calls and background line hiss/noise.- At that time I was with BT and when I changed to the Asus DSL AC68U router it was a much better router and it cost less than the Fritzbox 7490.
That said: I do plan to give the Fritzbox 7530 a fair chance and a good try.
When I wrote about a mesh using Fritzbox Devices I had in mind a system similar to the one that you are using. - ie. A Fritzbox 7590 and a 1759E Repeater and I had also considered incorporating the supplied Fritzbox 7530 within the Fritzbox Mesh with everything being connected to the present homeplugs to try to reduce any Wifi backhaul between them.
The Fritzbox 7590 and a 1759E Repeater pack is available from Amazon UK for about £294 and the Fritzbox 7590 supports extra features such as Supervectoring 35b, (not available in the UK) and 4x4 Multi-User MIMO so it the supplied Fritzbox 7530 works well on the line that could be a viable option.
The combined pack available on Amazon UK is apparently the locked to the German Language Version which is a potentially good and bad thing. - Good because the Fritzbox German Versions get all the updates about a year before the International Versions and bad because my own knowledge of Technical German terms may not be good enough so I would need to buy the International Versions.