@Tejas Pandya Since you have 1.4 Cr and 14 accounts (average of 10L / account), I think best will be regular BHNI (~10L). In my view this calculation will only work consistently if you have extra capital and can apply larger lotsize with low chance of competition
For eg, if an IPO has 14x oversubscription (eg. Tata tech, with min. BHNI size of 67 lots), and you try lets say 137 lots x 7 applications (~20L / lot); if you are the only one, yes you'll get assured allotment, but in case there are more people (let's say another 7 ppl), then your probability is halved compared to just applying all 14 in BHNI. You don't want to worsen the probability.
Hypothetically, if you had 2.8 Cr and 14 accounts, then what would be better than 14x BHNI would be to apply something like 14x 136 lots if the extra 1.4 Cr is not being utilized on any other IPO. An even more lucrative approach could be 7x 136 lots & 7x 137 lots giving you a great chance of 2 assured lots, while retaining regular probability worst case if the lotsize gets more subscriptions. Hope I'm making sense.