Yeah i used to over mod the heck out of the game, got bored, left for like a month (October) then came back stock... and haven't looked back. Although now i spend more time on the forums than in game (because of My aerospace company). My advice: play stock, learn it, then you can blame the mods. Untill then you don't know if the mods or your own unfamiliarity are the cause of the problems.