I'd say opening the throttle too quickly rather than too soon is the problem for bad take-offs, certainly IRL Bf.109's.
This might apply to the RC versions too - being eager to fly and thinking its only a model sometimes means that some of the mistakes of real life pilots are recreated.
then again, when I had my Foxjet 26" with 2ch Futaba and an unbadged 0.20cc-ish glow motor (its carburettor was inside the rear wall of the engine units fuel tank/engine mount. I briefly had it flying - I did the same sort of tak-offs... it went up stalled, regained flight speed, then stalled again into the ground... perhaps in hindsight, I also shouldn't have used the radio sytem from my Kysho Raider circuit car in it - little to none adjutment settings to limit servo control throws/limits - inexperience, eagerness and over controlling reduced it after a few attempts to split obeche wing skins and ripped through firewall motor bolts.