Maybe you could try the "Ease My Flex" (EMF) modification. There is ample information on it in the Fountain Pen Network (google
site:www.fountainpennetwork.com ease my flex).
I have a few pens with modern flex nibs, and in my case that has worked like a charm. Mine are Noodler's Nib Creepers with Noodler's flex nibs and Jinhaos with Fountain Pen Revolution (FPR) USA nibs. I modified all of them in order to be able to do Copperplate calligraphy more easily (I do also have good old faithful dip pen nibs for nib holder, the kind one cannot put in a fountain pen, but that give great line variation, both Zebra G -normal and titanium- and a box of vintage nibs, but a dip pen lacks the convenience of an FP for practicing).
It is better to have a couple of spare nibs to try, just in case. The ones sold by FPR are actually made in India by Kanwrite if I remember well, and -I must say- very good. If you are in India, it may be cheaper for you to get them. FPR also sells hand-tuned flex nibs with the EMF mod. It shows some railroading.
The pic below is a Sanskrit Schloka I copied with a Baoer 79 pen with the nib swapped by a Fountain Pen Revolution USA nib that I modified myself (if you zoom in, you may notice the sides of the nib have been eaten out with a dremmel tool), in an A6 notebook. This is a #5 nib. A #6 gives more variation.
That said, if you are happy with it as it is now, I would leave it as is. No need to break things needlessly.
As for the ink flow, that is typical of new fountain pens: makers use machine oils when producing the pen, and there usually remain some machining oils in the feed when you buy one. As the ink is water-based, this may cause flow issues. This can be solved by flushing the pen first a few times with water (just hold it under the faucet/tap stream). Otherwise it solves itself as you use it and the ink carries remaining oil out.