Not at all weird. If you watch a video of how to give a woman a body-breaking orgasm, it looks like you're trying to break into a bank vault with two fingers - very rough. The G spot is only a few inches inside the vagina, and hard, directed stimulation with fingers can be more pleasurable than dick. I generally reserve a finger bang (and accompanying reach around clit stim) for when Im tired as fuck or she wants a quickie, a word that my penis wholly rejects.