Yah I tried that Blakoe ring. It didn't do anything. For a while everyone was buying or making those things due to some guy promoting them as a "ring of power" but they really didn't work, trust me.
For me, the only thing that really increases load size is prolonged sexual activity, without cumming, leading up to the event (this is also called 'edging').
Of course you will hear people swear by Maca, arginine, water, lecithin, etc. Those things are all good for your body but their effect is negligible and the supplements cost $$.
So for now, edging is the best. Until someday when someone makes a medicine that selectively targets your bulbospongiousus muscles. Those are what what contract when you spew.