The way I see it the TP spirit link thing has so much potential but it's really, REALLY difficult to use. The only time I've ever had it is when I refrain from healing or using a WS for like 1-2 fights so the Wyvern gets 200% TP+(this lowers my overall DPS because I'm not expending TP by the way) then on the next mob I have to hit a macro which contains

/attack <t>
/wait 3
/ws [Insert WS here}

this allows me to engage a mob and WS IMMEDIATELY(read:before i autoattack once) which allows me to WS without the wyvern using a breath. This doesn't always work by the way due to lag or the enemy moving. Engaging without the wyvern hitting allows the wyvern to retain its TP, thus allowing me to Spirit Link TP back to myself and WS again. It takes a fight or two to set this up and in the end might not even be worth it since I'm refraining from using a WS or two while my wyvern builds adequate TP. In other words, the usefulness of this WS is obfuscated by the mechanics of the Wyvern which make it a difficult property to benefit from. They might as well have never implemented it due to it rarely being beneficial. I know they want Spirit Link to mainly be used to heal or level up the wyvern or give it buffs with Empathy instead of a DD option with the TP transfer, but at least give us the option to make it used for the TP transfer with a pet command that restricts breaths.