Clianthus Puniceus - Lobster Claw / Parrots Beak

Not surprisingly our mature Clianthus wasn't keen on the winter weather but it is making a recovery and plenty of new growth. It is however still looking rather sparse in terms of foliage although it put on a good show of flowers. The one thing I have however noticed and not noticed before is that it is absolutely covered in Greenfly. It's not something I would normally worry about or take action as I let nature take it's course to a degree but with the plant still in recovery mode is it likely this infestation is holding it's recovery back?
Should I spray or leave as is?
Thanks
Should I spray or leave as is?
Thanks
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I have pruned it in the past and generally OK but occasionally it seems to induce some kind of 'die-back' on the branch in question. I'll do some reading on that in case there's something I need to do / avoid.