If it was snappy before then it isn't going to be any better when repaired. An overly snappy model that surprises you with unwanted snaps strongly implies that the wing loading is too heavy. And all the repairs it's going to need are not going to help in that regard. If the plane was just plain vicous and it caught you off guard and snapped into the ground leaving you with a WTH look on your face then I think I'd suggest a nice warm bonfire with a "good riddance" glass of wine to toast its passing and move on to a better flying option. Really. We just can't fix "heavy".

What you're looking for is trigonomic tools. Lucky for you the Windows operating system comes with a Calculator program which has the trig functions in it. If you don't see the trig and other scientific functions then click on "View" and click on "scientific". To use it to find the offset dimension for a 5 inch firewall enter "1" then click on "sin". The resulting small value is then multiplied x5 to find the amount of set back to the right side for a 1 degree offset. As it happens it's .087 inch. Try it a few times to get familiar with the function.