Yeh renos can be tough, I did mine, installed 100 sqm of 20mm hardwood timber, new walls, bulkheads all around, new bathroom, kitchen, laundry, did all that working 6 days a week, never again.
Gains of 10% over E85 , I wanted to see if that was the case with Veva's car. So 400rwkw will see 440rwkw. If that's the case might be able to crack a 9 on my std turbo.
Just about everyone running E85 with 400-500rwkw on 12mm headstuds are lifting the heads, due to a higher cylinder pressure. Mine was lifting, glad its fixed now.