jblizzle is right on both counts. It's a common misconception that the hotter the water is coming out of your heating system the better. This notion is used incorrectly by those with fancy "pro" systems as well as DIYers. It's about the volume of warmer water more so than the temperature. A properly tuned solar heater will only raise water temp running through it by a few degrees, because the goal is to warm a lot of water by a little bit, not warm a little bit of water by a whole bunch.
And as long as your pool is properly circulating, it won't matter where you introduce your heated water. On the other hand, if you're throttling back the flow to get the water as hot as possible in the hose, before you put it into your pool, then it also won't matter much where you introduce it, because without good circulation, it won't do much no matter where it comes into your pool.
To maximize your heater's efficiency, push enough water through it so that it is really pushing the water around in your pool, but feels just barely warmer coming out of the hose than the pool water. Totally counterintuitive, right? But that's how it works...