Thank you bro.
That was really helpful.
Yes I guess I had to set a higher reward.
I see more and more unconfirmed transactions with every week passing by.
Is this "Scaling" problem that's rumored to fork Bitcoin into two separate currencies?
.P.S.: Although I got in here at 2013, I didn't get back here until 2017 - missed out big time

The scaling problem was/is because the blocks are still 1 Mb.
Simplification: there were 2 camps, 1st was bitcoin core which wanted to install segwit, and the 2nd was bitcoin unlimited who wanted increasing blocksize.
Segwit needed 95% before they could start, BU needed only 51% but then there was a hard fork, so two different currencies.
Fortunately a few days ago both parties agreed: segwit will start at 80% (or so) and immediately after that the blocksize will be 2 Mb. They want to implement this before or around september. In this case there is first a soft form (segwit) then a hard fork (blocksize), only in this case the leftover-currency will get no support, so I guess most miners/pools will go with this.