If youre happy bowling as you are and that is for fun stick with what you are doing.
However and this is what has happened to me. I, like you want to achieve the best of my ability and to do that coaching is basically a must.
Some may disagree, mostly people who have worked long and hard at their games and have found something that works for them.
However if you want to get better quicker and have a real understanding of how you get there, get a coach. Everyone has problems at times, but with a coach most of them can be spotted very quickly and put right. Something you cant do if you dont know exactly how your swing works.
Try to find a good coach, one who will help you to improve from what you have now. That is pick your good points and improve your weaker ones. I think its the best way to get faster improvement.
A good coach is worth his weight in gold as he gives you an improved game,self-belief and a shoulder to cry on.
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Happy go lucky bowler from the UK
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Did someone say tough luck