VPI's do not lack mid-bass, IME. I used to have an Aries 2 for about 3 years in my system and really liked it. I ran it with the JMW 9 and later an SME IV, both tonearms set up with a Benz Micro Reference cartridge. Mid-bass was quite tuneful and satisfying with either tonearm. Upgrading to another table, arm, and cartridge combo brought a much quieter background and more image focus and detail, but the mid-bass has not been dramatically different.
One way to improve mid-bass, perhaps, is to tweak the isolation under the table. I have a solid mass rack from Billy Bags (I like how it looks). I recently added a Grand Prix Monaco stand with Apex footers under my turntable and I noticed a significant improvement in the mid-bass. That was an eye opener, as I thought the sound was already suberb before the Grand Prix stand. The mid-bass is where I really noticed the difference.
Also, is your subwoofer properly integrated with your main speakers? Perhaps try auditioning your speakers without the subwoofer and see if the mid and low bass are integrated better.
Bottom line is I wouldn't give up on the VPI if the problem is mid-bass. I think the problem is elsewhere.
One way to improve mid-bass, perhaps, is to tweak the isolation under the table. I have a solid mass rack from Billy Bags (I like how it looks). I recently added a Grand Prix Monaco stand with Apex footers under my turntable and I noticed a significant improvement in the mid-bass. That was an eye opener, as I thought the sound was already suberb before the Grand Prix stand. The mid-bass is where I really noticed the difference.
Also, is your subwoofer properly integrated with your main speakers? Perhaps try auditioning your speakers without the subwoofer and see if the mid and low bass are integrated better.
Bottom line is I wouldn't give up on the VPI if the problem is mid-bass. I think the problem is elsewhere.