You could stick with 3/8 tubing, but I wouldn't: it'd be too big of a pressure drop. Of course this doesn't mean that you'll get much better temperatures.
In your case, you need to do a couple of things:
#1: use a big ID hose for the pump inlet. Everything else can stay the same.
To simplify your setup, you can put the res after the blocks, and before the pump: it should minimize the amount of modification you'll have to do (Use 1/2 tubing only from the res to the pump).
#2 if you decide to drop the 3/8 tubing, it would be easier for you to replace the fittings on the blocks, to something that can accept say, 1/2 ID tubing. Personally, I prefer polypropylene (or nylon) barbs, with hose clamps (brass is also easy to find). This of course is completely up to you.
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