That's something fairly unique to DTHC.... it seems to cover all of your bases. Further estrogen restriction (not a fan of) is an option, or Prime might even be a possible stacker.
Drive and RPM both contain Icariin, and if run at the recommended dosages alongside DTHC, you might have some redundency. Nothing harmful or negative I would assume, but it just might yield diminishing returns. It is unclear to me however how much Icariin is in any of these products - they aren't listed in their writups.
Bulk forskolin might be a go however, for a Drive-esque addition to your stack. RPM pre-workout is almost always good to go.
If you run DTHC for 8 weeks, I'd say splurge on an extra bottle and run it at the higher dosages. Drive is excellent, but might not be the ideal *cost-effective* stacker. Bulk forskolin - affordable.