Mrat, looks like the issue is your way of getting enjoyment out of this particular game. Sure, if you get a bigger ship, things will generally go smoother. But to this day, I have an Annie and a Vette, but the most enjoyable moments came and still come from medium and small ships, particularly the FAS, the FdL, the iCourier, the Cobra, the Sidewinder (!), the DBX, the Dolphin and on and on. So, different things, different results, a somewhat complex game. Open your mind.
More specific comment: you just have to either practice more (keep proper distances and position against wings, know when to advance and retreat, fly properly, manage pips) or go for one of the big three, if your focus is really credit efficiency.