225/35 and 225/40 are not ETRTO recommended sizes on a 7J rim.
I would go for 215/45R20 front and 235/40R20 rear on those rims. That should also help give you more confidence and safety when cornering on the limit.
Outside diameter of 215/45R20 is 701.5mm
Outside diameter of 235/40R20 is 696mm
So when the front has 2.75mm of tread wear, it will equal the outside diameter of the rear tyre.
Or in percentage terms, the front tyre has an outside diameter 0.8% more than the rear.
Not only that, but there are two matching Michelin tyres in those sizes.
Michelin Pilot Sport 4S PS4S - 215/45R20 95Y XL
https://www.camskill.co.uk/m63b0s9268p196556/Michelin_Tyres_Car_Michelin_Pilot_Sport_4S_PS4S_-_215_45_R20_(95Y)_XL_TL_Fuel_Eff_%3A_C_Wet_Grip%3A_A_NoiseClass%3A_2_Noise%3A_71dB
Michelin Pilot Sport 4S PS4S - 235/40R20 96Y XL
https://www.camskill.co.uk/m63b0s11827p167799/Michelin_Tyres_Car_Michelin_Pilot_Sport_4S_PS4S_-_235_40_R20_(96Y)_XL_TL_Fuel_Eff_%3A_C_Wet_Grip%3A_A_NoiseClass%3A_2_Noise%3A_71dB
235/40 also isn't ETRTO approved for fitment to a 7.5J rim. However, it fits a 7.5J rim better than 245/45 fits a 7.5J rim, which is an ETRTO approved fitment.
The problem with ETRTO's approvals, is that ETRTO groups tyre sizes together.
According to ETRTO, 225/35 and 245/45 fit a 7.5J rim, but the tyre size in the middle of these two tyre sizes (235/40) doesn't fit. ETRTO has grouped 235/35 and 235/40 together, and because 235/35 doesn't fit a 7.5J rim, it follows that 235/40 doesn't fit (even though it does).
A second example is 185/70, 195/60, and 205/50. According to ETRTO, 185/70 fits a 4.5" rim and 205/50 fits a 5.5" rim, but 195/60 doesn't fit a 5J rim. The reason being, is that ETRTO has grouped 195/50 and 195/60 together (along with 195/55 and 195/65)...and because 195/50 doesn't fit a 5J rim, it follows that 195/60 doesn't fit a 5J rim (even though it does). In fact, the 195/60 tyre size fits a 5J rim better than a 205/50 tyre size fits a 5.5J rim.
A third example is 185/50, 195/60, and 205/70. According to ETRTO, 185/50 and 205/70 fit a 5J rim but 195/60 doesn't...even though 195/60 is in the middle of the other two sizes. Again, ETRTO has grouped 195/50 together with 195/60 (along with 195/55 and 195/65)...thereby preventing the approval of the 195/60 tyre size for fitment to a 5J rim. In fact, the 195/60 tyre size fits a 5J rim better than a 185/50 tyre size.