Plumbing hydronic baseboard with PEX B

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New York State
Hi All,
I'm getting ready to plumb in heat for a house that my son and I are renovating. The boiler is new, but we stripped out the 1/2 black iron pipe to all the old cast iron radiators that we also removed, and are running oxygen barrier 3/4" PEX B . He is replacing all of those with Slant Fin baseboard. I've always used M copper for hydronic, but we wanted to do something different this time. I was planning on using Viega Pureflow fittings because I like the pressure/temp parameters of that system but I am having a hard time finding baseboard ell fittings which don't severely restrict flow. Can anyone recommend fittings that you actually know are not too restrictive? We have Proflex, Pureflow, Pex crimp, and Propress tools in addition to torches of course, so no option is off the table.

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