Loomis are the greatest baitcaster on the market.Although a few builds are not up to scratch for example never enough guides,small percentage built on the backbone,but if you choose right you will never look back.
The models you mentioned are top rods for barra maybe a little heavy for jacks the lighter model which is the 642 gl2 or 3 maybe the way to go.If the tip stiffness worries you go a little longer your dont give away the power just get a few more inches and a slightly softer tip.
Good luck in your decision
Travis