I am okay with the idea that the TG3-60 has lots of gears and is on the soft, slow side allowing a player who already knows how to hold the ball on the blade face a little longer to get really good spin. So it is possible that a fast blade with this rubber would not be totally bad for someone's development. But a skilled player like bobpuls whose technique is fairly good, and the people he might lend a blade to, may be a different level than someone who is saying they are beginner/intermediate level on their first post on the forum. I have a range of ideas of what beginner/intermediate might mean. And I feel like, a slower setup is never a bad thing for a newer player because it forces you to have better stroke mechanics to get decent pace and it allows you to take a fuller stroke without compromising control.
And regardless of how dynamic and controlled a rubber TG3-60 is, those faster blades still limit the amount of time you can hold the ball on the blade face UNLESS you have pretty decent technique and already know how to make high quality contact.
And truthfully, we would need to see footage of SynteKK to be able to formulate a better idea of what would be good for his development.
HOWEVER, in spite of the FH rubber choice, Tibhar Genius Sound on an Off+ blade would make developing the contact, touch and control to get good spin with the BH a total nightmare for most people who call themselves beginner/intermediate. That combination could really create problem down the road for SynteKK's BH.
I do think he could get TG3-60 for BH as well. But I would still pair that with a blade like Stratus Power Wood, Petr Korbel, Nittaku Tenor, or OSP Virtuoso Plus rather than a Off+ Carbon blade. Those blades I just mentioned are still decently fast and they would be the kind of blade that could help the OP learn how to caress the ball with the topsheet and sponge and let the topsheet really grab the ball while pulling past it to generate loads of spin.
And one thing I have noticed with rubbers like H3 and TG3 is, if you make more direct impact they are slow. But if you really get the topsheet to wrap and grab the ball, they are very fast and spinny. But that technique to get the topsheet to wrap and grab the ball, developing that technique, learning to develop that technique, is actually exactly why the faster blades make it harder for developing players to learn to do that.
There is too much allure to direct impact and too little natural dwell time from those fast hard blades for a player who does not have the technique already, to even feel the benefit of what happens when you really use the topsheet and sponge instead of the blade.
Tangential....tangential....learning how to grab the ball while pulling past it on a very tangential bias is much harder to understand when the equipment you use allows you to not understand the ramifications for an addiction to speed. When you know how to spin the ball well, as bobpuls most definitely does, that is totally different.
But regardless of how you look at it, to give SynteKK decent advice, we would probably need to see some footage of how he actually plays.