Tornado Replacement
As I am sure you know, there is a lot more to do with turning than just wing area. The F3 had effectively the same wing as GR1/4. It stuggled as a result of low specific turn rate and a lot of this was due to its low specific excess power. In the lead up to the Gulf War, a number of RAF F3's were fitted with engines with a bigger mass flow and higher pressur ratio LP Compressor (Fan) borrowed from the german air force ECR aircraft. These engines delivered about an extra 3Kn thrust each and because STR and SEP are non-dimensional, even a small thrust inctrese had a big effect on aircraft performance. However, after this conflict, the RAF decided not to embody this Fan, partly due to concerns over fatigue index (FI) consumption. As far as increased altitude, a bigger wing would develop more drag making the engines having to work much harder than they do already.