Ok. I will help out a Yonex VCore Tour G fellow. I play with the 310 version, but they both should be very similar.
I found that the best setups are:
1) full poly 17g that are low or moderately low powered as you said you can supply it yourself. Tennis should be play that way anyway. You would still have plenty of power with this stick, so don't worry.
2) you can try soft poly for pocketing effect or firm for less. It's a matter of preference. Look for the crispy kind of poly as you will feel very connected to the racket. I am at this stage right now, figuring out whether I like the pocketing or firm setup.
3) string it around 50lb plus/minus 3lb (both main and cross at same tension). I guess this is a matter of preference. But Poly perform best at this range I think.
So here are what I've tried and loved the crispy, total control, and enough power sort of sessions. The vCore Tour G 310, oh how I love thee! BTW, I have leather grip and overgrip, no dampener, and play it straight up like that. I string at 48lb for both main and cross. I am a legit strong 4.5 who plays league and local tournaments. All court type of player with modern techniques.
Pocketing / soft yet crispy 17g poly:
- Genesis Black Magic: very soft and a lot of pocketing effect. I have to re-test this again.
- Isospeed Baseline: amazing performance for the price! pocketing yet crispy! Will get a new reel of this again.
Firm and crispy 17g poly:
- Tier One Durafluxx: This is my go to string right now! Love how it's very crispy, spinny (hexagon 6-sided string yet consistent), control oriented, and has that extra power when you need it. And oh, it played really nice and consistent for around 10 hours! Softer and a bit more power than Solinco TourBite. When I hit with TourBite, I felt like I had to work too hard. Try it Durafluxx for sure! There is a special intro pricing at Tier One's website. I just got a reel of this.
- Solico Tourbite: see above. I prefer Durafluxx over it hands down. Price is much better with Durafluxx too!
Gut / Poly hybrid:
- Global Gut 17g (57lb) / Genesis Black Magic 17g (50lb): Need more testing and tweaking. I miss the ball bite of full poly. The setup still have too much power as I didn't feel comfortable swinging all out.
BTW, I refuse to buy expensive Poly's and that being anything over $130/reel. Is your game really gonna improve by that much more? Don't think so. Look at Isospeed Baseline, it's freaking amazing for $40/reel. May last only around 6 hours, but fresh Poly strings are always better anyway, no matter how you slice and dice it. So, just string up fresh Baseline for matches and use old one for practice.