The 225's up front will help to reduce understeer quite a bit. Good choice.
With a stock suspension, you can ask the shop to dial in a little more front negative camber to improve cornering which will also help reduce understeer by keeping more of the tire on the road for improved front end grip. However, be aware that this will also increase the wear on the inside 1/3 of the tire so like most things in life, its a tradeoff. The more front camber, the more inner tire wear. Sorry, there's no free lunch.
Last, try evening out the front and rear tire air pressures from the 29F/36R that the factory recommends to something like 32F/34R. This will also tend to reduce understeer.