To achieve both maintaining the tie bar strength and control the tie bar and lead half etch depth gap below 0.01mm, lead half etch depth has to get shallower.
In this case, the space between the lead and the heater block could change. Will not it be your concern?
If it is OK, we can try to target at gap < 0.01mm for your evaluation by building a fine-tuned new artwork pattern
Once you confirmed it is good, it can be deployed to mass production.
If the above proposal is fine with you, we will quote the tooling to your Purchasing Team (P/N: A0076QN008F01).