It appears it might be beneficial to look at exactly what the Blade v6 is, and what it isn't, before throwing our racquet recommendations. I'll use the Countervail version as the example (even if it's the non-CV version, the major specs still line up, minus the feel):
So, here we have what many regard as the last higher-power Blade (until the v9 made up at least some ground), with a firm 66RA, medium 326 strung SW and a head-heavier-than-normal balance of 3pts HL, that definitely pulls the player into the court. It's an attacking baseliner's control frame, with good but not overwhelming power. The CV version had a very muted/muffled feel; the non-CV very direct and raw.
First off, before even looking at other frames, what have you done with customization and/or string setup to try and get more power? If you've only played with various string tensions, gauges and types, then that's a good start, but I definitely try adding some lead tape to the hoop, specifically up towards the tip, or at 10 and 2 o'clock on the racquet face. A little goes a long way. Start with 1-2g, then increase to as much swing weight as you can reasonably handle. That will go further than anything else to increase the power of what you already have in your hands.
Beyond that, to find more power in a new frame, at similar spec or not much higher, you'll need either a wider/more-elliptical beam, firmer flex, larger head size and/or more open pattern, or some combination of all. But to keep precision and control similar, you'll want the string pattern similarly as dense/composed as your Blade 98. That narrows down the feel a fair bit.
Looking at other frames, I know there are those who would recommend other Yonex's, but it sounds like your issues are endemic of a mismatch with the Yonex hoop shape and/or sweet spot location, so I'm not sure another Yonex is the answer here. A more consistent alternative to the VC98 might be a spec'd up EZone 98 or Percept 100D, or stock EZone Tour or VCore Tour, but even so, your ultimate match may be something more like what you're used to, including simply another Blade. Here's the list of what will still give you similar precision and consistency, higher power:
- Babolat Pure Strike 98 16x19 – Thicker mid-beam and higher stock swing weight.
- Dunlop CX 400 Tour – A 23mm constant-beam 100 with similar stock SW, but unlike a Speed MP it's more accurate and handles more like a 98.
- Prince ATS Tour 98 – A little on the soft side, but it has the hoop weight and bit thicker hoop.
- ProKennex Ki Q+ 5 – Slightly higher stock SW, and a 100, but 8 throat mains and 16x20, for nice blend of power/control.
- Wilson Blade 100 v9 – Will be more forgiving and hit a slightly bigger ball when spec'd up identically.
- Wilson RF 01, spec'd up – Probably too head-light a weight distribution and too variable a string bed to feel usable enough, even after customization, but possibly worth a demo nonetheless.
- Yonex EZone 98, possibly EZone Tour – Higher-powered, yes, but potentially no more controllable than the VC98.
- Yonex VCore Tour - More stable, less-fluttery/random hoop, but string pattern is still the same, so not sure how much more controlled it could be for you.
- Yonex Percept 97, ideally a 97L, spec'd up – The closest to what a Blade would behave like, more consistent string bed than any VCore, albeit it will require customization.
- Yonex Percept 100D, with some tip weight - Similar benefits as the 97's, just a bit more laterally accommodating. Could be a winner if agrees with your hitting style.
Hope that helps. Any questions, feel free.
