Your room to maneuver depends on whether you have a fully transparent pricing model reflected on your website or if it is somewhat general on the pricing page so that your reps can customize.
If I were to guess, this is a transparent pricing page on your website.
1. Package Definition: It could be worth considering what would increase package differentiation more so that your prospects have a clear choice in front of them. To do this correctly it is important to try to reduce the overlap between the segments targeted by the packages. You can also consider adding a decoy package to move people to a clear choice. See famous example from The Economist

2. Sales Process: If you are not a company with completely transparent package prices on your pricing page, then you can actually offer the right package to the prospect vs getting into the shop-a-package discussion. You really want to avoid the latter discussion if cannibalization is a risk. Do this buy ensuring there are no comparitive package collateral or slides available to your reps and train them not to compare packages. Give them total control of the sale. The packages exist to capture the maximum value from the market and this already aligns with your sales reps' incentives, use that to your advantage.