Setting up a VPS Hostname ( + Cloudflare Nameservers )

Hey everyone, I'm hoping for some advice / help please; I've picked up a nice deal on a VPS and I'm looking to learn how to setup / protect and work a server. I'm not content with shared hosting anymore and also thirst for tech knowledge! So my VPS provider have given me an ip and a defualt 'server1.vps.myhost.com' hostname for the server. I have a domain registered elsewhere, however it is sitting on Cloudflare's network. I ran through a setup of WHM / CPanel and updated the nameservers to reflect the designated Cloudflare NS's and also set my hostname as server1.mydomain.com. I then created an A entry in Cloudflare for server1.mydomain.com pointed to my sever IP (I'm not sure if this is correct...) I'm not at a point then when I visit mydomain.com I hit my site, protected by Cloudflare, however should I visit mydomain.com:2087 I am redirected to server1.vps.myhost.com:2087. The same for CPanel. I've ssh'd in and checked my /etc/hostname and /etc/hosts files are showing server1.mydomain.com. sudo hostname also returns my correct hostname. For some reason however I keep seeing the vps.myhost address - I don't want any record of server1.vps.myhost.com as this can be run against a simple look up to query the server IP. Can anyone provide some assistance on the steps I need to take or a possible reason this hasn't changed? Thanks in advance for any / all comments. [COLOR="silver">- - - Updated - - - "I'm not at a point then when I visit mydomain.com I hit my site, protected by Cloudflare, however should I visit mydomain.com:2087 I am redirected to server1.vps.myhost.com:2087. The same for CPanel." ^^ This should read "I'm NOW at a point...."