14 oz!
Wild,
Man, 14oz in the nose just does not sound right with a DLE 20 up there.
Please recheck your balance point and/or your balancing method.
I was able to balance my 540 @ 115mm from the LE using 61g servo's all around and a Moki 1.35 (29oz.) engine with a pitts style muffler without ANY added weight. Moki was mounted as far back as I could get it, don't have the firewall to motor dimension.
It flew beautifully, the only plane I've ever had that required no forward elevator stick to fly straight and level, inverted, @ about 1/3 throttle.
Total weight of 10lbs, 13oz. Bit of a porker, but what a flyer!
Google says your DLE 20 weighs 28.9oz and the Hitec 425's weigh 45.5g each.
Something is definitely out of whack here.