It would take a lot of fittings, tubing, and blocks to make a DDC 3.25 drop below the 'magic 1.5GPM'.

As long as you aren't expecting any uber cooling from this, it will behave just fine. If you need more than it offers, I would suggest, like others in the thread, that you use BP DualRotary 90deg fittings, rather than the single rotary 90deg you have on the pump. Also, I was curious why turning the pump around wasn't an option ?